The Qur'an unequivocally asserts its own divine origin, declaring This is the Book about which there is no doubt. Tafsir al-Jalalayn confirms this, stating there is "no uncertainty that it is from God." Ibn Kathir elaborates, explaining that "Rayb" (doubt) is negated, signifying that the Qur'an is undoubtedly revealed from Allah. This assertion is echoed in other verses, such as These are the verses of the wise Book and 46:2. The Qur'an also emphasizes its role as a "guidance for those conscious of Allah", with Ibn Kathir noting that "Hidayah" (correct guidance) is specifically granted to those with "Taqwa" (fear of Allah).

Beyond the Qur'an, Islam affirms belief in previous scriptures, asserting that Allah sent down to you the Book in truth, confirming what came before it, and He sent down the Torah and the Gospel aforetime as a guidance to mankind. This continuity of divine revelation is crucial, demonstrating that the core message of monotheism and submission to Allah is timeless. Prophets like Musa (Moses) were given the Scripture and the criterion, referring to the Torah, which served to differentiate truth from falsehood, as explained by Ibn Kathir. Similarly, Isa (Jesus) was taught the Book and wisdom and the Torah and the Gospel. The Qur'an mentions figures like John (Yahya) being told to take the Scripture with determination and Abraham, Moses, and Ishmael as prophets mentioned [in the Book](19:41, 19:51, 19:54).

The concept extends to the universality of prophethood and scripture, as Mankind was [of one religion before their deviation; then Allah sent the prophets as bringers of good tidings and warners and sent down with them the Scripture in truth to judge between the people concerning that in which they differed]. Ma'arif-ul-Quran explains that this unity of belief in God's Oneness prevailed initially, and prophets and books were sent to resolve subsequent disputes. Thus, "Al-Kitāb" signifies a continuous stream of divine instruction, culminating in the Qur'an, which serves as 16:89.

The role of prophets, particularly Prophet Muhammad, is intrinsically linked with "Al-Kitāb". Abraham's prayer to Allah to 2:129 was answered with the sending of Prophet Muhammad. This verse highlights three core functions of prophethood: reciting Allah's verses (the Qur'an), teaching the Book and wisdom (the Sunnah), and purifying the people. Ma'arif-ul-Quran emphasizes that "Tilawah" (recitation) involves not just reading words but obeying them fully, and "Hikmah" (wisdom) refers to the Prophet's Sunnah and its principles. Ibn Kathir confirms that "Al-Hikmah" here means the Sunnah.

The Prophet Muhammad's role as a teacher and purifier is elaborated upon, as he was sent to “purify you and teach you the Book and wisdom and teaching you that which you did not know”. Ma'arif-ul-Quran notes that this includes cleansing from idolatry and teaching practical knowledge. The Sunnah, though not recited in prayer like the Qur'an, is considered a "Ghayr-Matluww" (unrecited) revelation, with its meanings originating from Allah.

A significant aspect of prophetic guidance concerns the interpretation of "Al-Kitāb." The Qur'an itself distinguishes between "Muhkamat" (clear, unambiguous verses) and "Mutashabihat" (allegorical or unclear verses). Allah states that in it are verses that are entirely clear, they are the foundation of the Book, others not entirely clear. So as for those in whose hearts there is a deviation, they follow thereof that is not entirely clear seeking affliction and searching for its hidden meanings; but no one knows its hidden meanings but Allah. And those who are firmly grounded in knowledge say: "We believe in it...". Imam Ahmad recorded 'Aishah narrating that the Prophet warned against those who focus on the Mutashabihat to sow discord. Ma'arif-ul-Quran clarifies that interpretations of Mutashabihat must align with the Muhkamat. Tafsir al-Jalalayn adds that the Muhkamat form the "Mother Book," the basis for rulings.

The integrity of "Al-Kitāb" is paramount. The Qur'an condemns those who 2:174 and those who 3:78. Ibn Kathir identifies these as Jews who hid the prophecies about Prophet Muhammad for worldly gain. This deliberate distortion of scripture is seen as a major sin, leading to severe punishment.

"Al-Kitāb" serves as the ultimate source of Islamic law, providing a comprehensive ethical and legal framework for humanity. The Qur'an explicitly states, Indeed, We have revealed to you, [O Muhammad, the Book in truth so you may judge between the people by that which Allah has shown you]. This establishes the divine mandate for judgment according to revealed law.

The concept of "Birr" (righteousness), as delineated in the Qur'an, encapsulates the comprehensive nature of Islamic conduct. 2:177 righteousness is in one who believes in Allah, the Last Day, the angels, the Book, and the prophets and gives wealth, in spite of love for it, to relatives, orphans, the needy, the traveler, those who ask for help, and for freeing slaves; and who establishes prayer and gives zakah; those who fulfill their promise when they promise; and those who are patient in poverty and hardship and during battle. Those are the ones who have been true, and it is those who are the righteous]. Ma'arif-ul-Quran describes "Birr" as an "umbrella word... which combines in itself all acts of righteousness and obedience, inward or outward."

Specific legal rulings derived from "Al-Kitāb" include those related to family law, such as divorce. The Qur'an instructs, when you divorce women and they have [nearly fulfilled their term, either retain them according to acceptable terms or release them according to acceptable terms, and do not keep them, intending harm, to transgress against them]. This verse emphasizes fairness and prohibits malicious intent in marital affairs. Ma'arif-ul-Quran explains that actions related to marriage and divorce, even if done in jest, are binding.

The treatment of orphans and the protection of their property are also central, as highlighted in give the orphans their property and do not exchange the bad for the good. And do not consume their properties, adding them to your own. Indeed, that is a great sin. This is further clarified in the context of marriage, where guardians are warned against marrying female orphans without ensuring fair dowry and just treatment, otherwise they should marry (other) women of your choice, two or three, or four. The Shafi'i and Hanafi schools hold different views on the permissibility of marrying non-Muslim bondwomen, but there is consensus on the preference for free Muslim women and the prohibition of exploiting orphans.

Regarding inheritance, "Al-Kitāb" introduced revolutionary changes in pre-Islamic customs that deprived women and children. The Qur'an mandates, For men there is a share in what the parents and the nearest of kin have left. And for women there is a share in what the parents and the nearest of kin have left, be it small or large - a determined share. Ma'arif-ul-Quran details how this established specific shares, overriding customs that favored only adult males. The verse concerning "Kalalah" (a person who dies leaving no ascendants or descendants) further elaborates on inheritance for siblings from the mother's side, a ruling that, according to Ibn Kathir, was once a point of confusion for Umar but was clarified by the Prophet.

Belief in "Al-Kitāb" is a fundamental pillar of faith, encompassing all revealed books and messengers. Muslims are commanded to 4:136. This verse underscores the interconnectedness of these beliefs. Ibn Kathir explains that differentiating between prophets or disbelieving in any one prophet is considered disbelief in all of them.

The Qur'an issues stern warnings against those who deny or distort "Al-Kitāb". Those who believe in part of the Scripture and disbelieve in part are promised "disgrace in worldly life; and on the Day of Resurrection they will be sent back to the severest of punishment." Ibn Kathir illustrates this with the example of the Jews in Medina who observed some laws of the Torah while violating others for worldly gain. Similarly, those who conceal what Allah has sent down of the Book are warned that "those consume not into their bellies except the Fire."

The concept of "Kufr" (disbelief) is not merely a lack of belief but often an active rejection or distortion of truth. The Jews and Christians, despite having access to scriptures that foretold Prophet Muhammad, 2:101]. Ma'arif-ul-Quran explains that their denial stemmed from envy and a refusal to acknowledge truth, not from ignorance.

Hypocrisy, a deceptive outward show of belief while concealing disbelief, is also condemned. The Qur'an describes hypocrites as those who say "We believe in Allah and in the Last Day," but they are not believers. Ibn Kathir identifies hypocrisy as showing conformity while concealing evil, warning that it leads to eternal residence in Hell. Such individuals are likened to those who kindle a fire for light but are then left in utter darkness, or those caught in a thunderstorm, walking only when lightning flashes, yet stopping when darkness covers them (2:17, 2:20). Their actions sow mischief on the earth, even if they claim to be reformers, as such actions ultimately undermine moral and social order, according to Ma'arif-ul-Quran.

Beyond its legal and ethical dimensions, "Al-Kitāb" offers profound spiritual lessons and reminders of Allah's pervasive providence. The immensity of Allah's words is conveyed by the verse 31:27, replenished thereafter by seven more seas, the words of Allah would not be exhausted], signifying the boundless nature of Divine knowledge and wisdom.

The Qur'an encourages believers to seek help through patience and prayer, especially in times of hardship. Seek help through patience and prayer. Indeed, Allah is with the patient. Ma'arif-ul-Quran expounds on the comprehensive meaning of "Sabr" (patience), encompassing endurance, self-restraint from sin, and steadfastness in obedience. Prayer is highlighted as the most perfect model of patience and an effective remedy for all difficulties.

The story of Adam's creation and his appointment as Allah's vicegerent on Earth underscores humanity's inherent dignity and capacity for knowledge, but also its propensity for mischief. The angels' questioning of Adam's appointment was met with Allah's declaration, I know what you do not know, revealing a divine wisdom beyond angelic comprehension. This narrative also establishes the obligation of appointing a just ruler (Khalifah) to uphold order and implement divine laws, a position requiring both spiritual and temporal authority, as noted by Al-Qurtubi.

The verses also remind humanity of Allah's absolute sovereignty and control over all affairs. “Say, "O Allah, Owner of Sovereignty, You give sovereignty to whom You will and You take sovereignty from whom You will. You honor whom You will and You humble whom You will. In Your hand is all good. Indeed, You are over all things competent."”. Ma'arif-ul-Quran explains that this verse serves as a reminder that worldly power and honor are entirely in Allah's hands, reassuring believers that victory ultimately rests with Him. This omnipotence also extends to providing sustenance, bringing forth life from the dead, and orchestrating the cycles of night and day.

Even in moments of spiritual struggle, "Al-Kitāb" offers solace. When Prophet Muhammad was injured during the Battle of Uhud, and companions were disheartened, Allah revealed, Not for you is the decision; whether He turns in mercy to (pardons) them or punishes them; verily, they are the wrongdoers. This emphasized that ultimate decision-making belongs to Allah, offering comfort and reassurance.

"Al-Kitāb" illuminates the path to ultimate success: paradise. Described as Gardens under which rivers flow, it promises eternal delight, pure spouses, and divine approval. The spiritual state of martyrs, who are considered alive with their Lord, receiving provision, is a profound example of the eternal reward for devotion and sacrifice. This promise extends to all believers who obey Allah and His Messenger, placing them in the company of prophets, the truthful, martyrs, and the righteous, a company of "excellent companions."

In essence, "Al-Kitāb" provides a comprehensive guide for human existence, from foundational beliefs to practical legal rulings, ethical imperatives, and profound spiritual insights. It is a constant reminder of Allah's infinite wisdom, mercy, and justice, offering a clear path to success in this life and the Hereafter for those who believe and act upon its teachings.