وَإِذْ أَخَذَ اللّهُ مِيثَاقَ النَّبِيِّيْنَ لَمَا آتَيْتُكُم مِّن كِتَابٍ وَحِكْمَةٍ ثُمَّ جَاءكُمْ رَسُولٌ مُّصَدِّقٌ لِّمَا مَعَكُمْ لَتُؤْمِنُنَّ بِهِ وَلَتَنصُرُنَّهُ قَالَ أَأَقْرَرْتُمْ وَأَخَذْتُمْ عَلَى ذَلِكُمْ إِصْرِي قَالُواْ أَقْرَرْنَا قَالَ فَاشْهَدُواْ وَأَنَاْ مَعَكُم مِّنَ الشَّاهِدِينَ
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سورة آل عمران
(3/81) When Allah took the Covenant of the Prophets, (He said): “I have given you the Book and the Wisdom, then a Rasul (Messenger) comes to you confirming that which is with you (Books Allah had given to you), you must definitely believe in him and you must definitely help him”. Allah said: “Do you agree and accept (My Oath)”? (They) said: “We agree”. (Allah) said: “Then bear witness and I am of the bearers of witness with you”.
Surah Al Imran