The Quran explicitly recognizes the Abrahamic heritage shared with the People of the Book, emphasizing the commonality of worshipping a single God. Allah states, 3:64. This verse, according to Tafsir Ibn Kathir, encapsulates an honest and righteous principle that is fair to both parties: to worship Allah Alone without partners, rejecting all other forms of worship. This reflects the universal message brought by all of Allah's messengers, as further underscored by the Prophet Muhammad's ﷺ letter to Heraclius, the Byzantine emperor, which began with this very verse.

Islam presents itself as the culmination of this monotheistic tradition, asserting that indeed, the religion in the sight of Allah is Islam. Tafsir Ma'arif-ul-Quran explains that "Islam" in this context refers to the fundamental principles and injunctions common to all prophets from Adam to Muhammad ﷺ – belief in Allah's perfect Being and Attributes, His sole worthiness of worship, the Day of Judgment, and all prophets and their teachings. Thus, earlier prophets and their followers were also considered "Muslims" in the general sense of submission to God. The Quran states, And He sent down the Tawrah and the Injil aforetime as a guidance to mankind, confirming the divine origin of these earlier scriptures. Tafsir Ibn Kathir highlights that the Qur'an not only confirms what came before it but also serves as a "criterion" (al-Furqan) that distinguishes truth from falsehood, providing clear evidence for guidance.

Despite the theological differences that later emerged, the Quran acknowledges sincere individuals among the People of the Book. It states, 3:199 humbly submissive to Allah]. Tafsir Ibn Kathir notes that these individuals, such as `Abdullah bin Salam, were among the best of the People of the Book, believing in their own prophets and then embracing Islam. Such individuals are promised a double reward, as indicated in other Quranic verses.

While acknowledging shared roots, the Quran also offers significant critiques of certain behaviors and beliefs among the People of the Book, particularly the Jews of the Prophet Muhammad’s ﷺ era. A recurring theme is their intentional distortion and concealment of divine truth. The Quran states that 2:101]. Tafsir Ibn Kathir explains this as their abandonment of the Torah's teachings, including prophecies about Prophet Muhammad ﷺ. This deliberate obfuscation is further condemned: 3:71].

Envy and obstinacy are frequently cited motivations for their rejection of Prophet Muhammad ﷺ. The Quran reveals, 2:109 after the truth has become clear to them]. This envy, Tafsir Ibn Kathir clarifies, stemmed from their recognition of Muhammad's ﷺ prophethood in their own scriptures but their reluctance to accept him because he was not from among them. The Quran emphasizes that 2:146, yet "a party of them conceal the truth while they know it."

Their history is presented as replete with instances of disobedience and the breaking of covenants with Allah. The story of the Sabbath-breakers, who were transformed into apes as a punishment for their deceitful circumvention of divine law, is a stark reminder of these transgressions. Tafsir Ibn Kathir narrates that they used "deceitful means to avoid honoring the Sabbath," leading to a punishment commensurate with their crime. Similarly, their worship of the calf after Moses's departure to Mount Tur is highlighted as an act of injustice (2:51, Tafsir al-Jalalayn). Their refusal to accept the arbitration of Allah's Scripture is also noted: 3:23. This defiance, according to Tafsir Ibn Kathir, was rooted in their false belief that “the Fire shall not touch us except for a number of days”, a self-deception born of their own inventions.

The Quran also exposes their hypocrisy, such as their tactic of feigning belief in Islam in the morning and rejecting it by evening, hoping to sow doubt among Muslims: a faction of the People of the Scripture say [to each other, "Believe in that which was revealed to the believers at the beginning of the day and reject it at its end that perhaps they will abandon their religion"]. Tafsir Ibn Kathir elucidates that this was a "wicked plan... to misguide the people" by suggesting they had found flaws in Islam.

Islamic law provides specific guidelines for interaction with the People of the Book, distinguishing them from polytheists due to their monotheistic heritage. The Quran permits certain interactions that are generally restricted with others:

Firstly, concerning marriage, the Quran explicitly states, lawful in marriage are chaste women from among those who were given the Scripture before you]. This ruling acknowledges their status as adherents of a revealed religion, enabling marital ties with Muslim men.

Secondly, regarding food, the Quran declares, 5:5. This permissibility generally applies to meat slaughtered by them, provided it adheres to their religious dietary laws, showcasing a degree of religious commonality.

Thirdly, in terms of governance, the Quran provides for the institution of Jizyah (tribute) for non-Muslims living under Islamic rule. Muslims are commanded to 9:29 until they give the jizyah willingly while they are humbled]. This tribute, as explained in Tafsir Ibn Kathir on 3:112, is part of a "covenant from Allah and a covenant from men," known as Dhimmah, which guarantees their protection and allows them to practice their religion, absolving them from military service.

Ethical considerations also govern interactions. Muslims are instructed to 29:46. However, this injunction comes with a caveat: "except for those who commit injustice among them," indicating that respectful dialogue should not extend to those who actively persecute or oppress. There are also warnings against taking them as allies against fellow Muslims or blindly following their counsel, as this could lead to disbelief: 5:57 and 3:100 unbelievers].

Prophetic guidance further clarifies these interactions. Abu Tha`laba Al-Khushani reported that the Prophet Muhammad ﷺ advised, "If you can get utensils other than theirs, do not eat out of theirs, but if you cannot get other than theirs, wash their utensils and eat out of it" Bukhari 72:4Muslim 34:12. Similarly, regarding greetings, Anas bin Malik narrated that when People of the Scripture greet Muslims, the reply should be, "Wa'alaikum (And on you)" Bukhari 79:32Muslim 39:8. This nuanced approach reflects a balance between respectful engagement and maintaining Islamic distinctiveness and cautionary awareness of their potential animosity.

The ultimate spiritual accountability for the People of the Book, like all humanity, rests on their response to divine guidance. The Quran unequivocally states that whoever does a wrong will be recompensed for it, and that 98:6. Tafsir Ibn Kathir underscores this by noting Allah's swiftness in reckoning for those who reject His verses and defy His messengers.

However, the Quran also provides a path to salvation for those among them who embrace the truth. It proclaims, those who believed and those who were Jews or Christians or Sabeans – whoever believed in Allah and the Last Day and did righteousness – will have their reward with their Lord, and no fear will there be concerning them, nor will they grieve. Tafsir Ibn Kathir clarifies that, after the advent of Prophet Muhammad ﷺ, this requires belief in his message. Those who were People of the Book and then embrace Islam are promised a double reward for their prior belief and their acceptance of the final message.

For those who persist in disbelief and transgression, there are consequences in this life as well. The Quran mentions, They have been put under humiliation [by Allah wherever they are overtaken, except for a covenant from Allah and a rope from the Muslims]. Tafsir Ibn Kathir explains this humiliation as a divine decree resulting from their disbelief in Allah's Ayat and their killing of prophets without right, which has historically manifested as being subdued by Islamic Law and paying Jizyah.

The Quran itself stands as a universal challenge and a clear sign for all humanity, including the People of the Book. It invites them: if you are in doubt, [O Muhammad, about that which We have revealed to you, then ask those who have been reading the Scripture before you]. This verse suggests that the earlier scriptures contained prophecies confirming the Quran. The divine challenge extends further, inviting skeptics to produce a Surah like it, a task that, as Tafsir Ma'arif-ul-Quran elaborates, has proven impossible due to the Quran's unparalleled eloquence, comprehensive wisdom, and miraculous nature. This challenge is not merely a linguistic one but a testament to its divine origin, reinforcing the universality and finality of Islam.

The People of the Book occupy a unique place in Islamic theology, distinguished by their monotheistic heritage and divine scriptures. While the Quran recognizes this shared foundation and invites them to universal truths, it also critically addresses their historical transgressions, including the alteration of scriptures, rejection of prophets, and acts of hypocrisy. Islamic jurisprudence outlines specific legal and social frameworks for coexistence, such as provisions for marriage and food, and the Jizyah, while prophetic guidance offers practical advice for respectful yet cautious interaction. Ultimately, the spiritual destiny of Ahl al-Kitāb, like all people, hinges upon their response to the final message of Islam brought by Prophet Muhammad ﷺ, a message of monotheism, righteous deeds, and submission to Allah, promising immense reward for those who accept it and warning of severe consequences for those who persist in disbelief.