Surah Ali 'Imran
وَإِذْ أَخَذَ ٱللَّهُ مِيثَـٰقَ ٱلنَّبِيِّـۧنَ لَمَآ ءَاتَيْتُكُم مِّن كِتَـٰبٍ وَحِكْمَةٍ ثُمَّ جَآءَكُمْ رَسُولٌ مُّصَدِّقٌ لِّمَا مَعَكُمْ لَتُؤْمِنُنَّ بِهِۦ وَلَتَنصُرُنَّهُۥ ۚ قَالَ ءَأَقْرَرْتُمْ وَأَخَذْتُمْ عَلَىٰ ذَٰلِكُمْ إِصْرِى ۖ قَالُوٓا۟ أَقْرَرْنَا ۚ قَالَ فَٱشْهَدُوا۟ وَأَنَا۠ مَعَكُم مِّنَ ٱلشَّـٰهِدِينَ
Wa iż akhażallāhu mīṡāqan-nabiyyīna lamā ātaitukum min kitābiw wa ḥikmatin ṡumma jā'akum rasūlum muṣaddiqul limā ma‘akum latu'minunna bihī wa latanṣurunnah(ū), qāla a'aqrartum wa akhażtum ‘alā żālikum iṣrī, qālū aqrarnā, qāla fasyhadū wa ana ma‘akum minasy-syāhidīn(a).
And [recall, O People of the Scripture], when Allah took the covenant of the prophets, [saying], "Whatever I give you of the Scripture and wisdom and then there comes to you a messenger confirming what is with you, you [must] believe in him and support him." [Allah] said, "Have you acknowledged and taken upon that My commitment?" They said, "We have acknowledged it." He said, "Then bear witness, and I am with you among the witnesses."
📝 Footnotes
104) The prophets covenanted with Allah, Glorified and Exalted is He, that if a messenger named Muhammad came, they would believe in him and support him. This covenant of the prophets binds their followers as well.