from following and supporting the messenger who comes after him, and his very prophethood may not stand in the way. Now Allah has indeed sent Muḥammad ﷺ, who arrived confirming the Scripture already in their possession (1). Moreover, Allah had taken a solemn covenant from the People of the Book that they would believe in him; fulfilling that covenant is therefore incumbent upon them. The Almighty mentioned only the prophets in the verse because a pledge laid upon leaders automatically extends to their followers, and if belief in and support for him is obligatory for the prophets themselves, it is even more binding upon those who follow them.
This is what is meant by the report related from ʿAlī b. Abī Ṭālib and Ibn ʿAbbās (may Allah be pleased with them). They said: “Allah never sent a prophet except that He first took from him the pledge that, if Allah were to send Muḥammad during that prophet’s lifetime, the prophet would certainly believe in him and help him; and He commanded that prophet to take the same pledge from his community: if Muḥammad is sent while they are alive, they will surely believe in him and support him.” (2)
Glad tidings of Muḥammad’s prophethood in the previous Scriptures:
The People of the Book therefore have no excuse at all for failing to believe in Muḥammad ﷺ, for