سورة Al-Imran ( The Famiy of Imran ) - الآية 81

And remember when Allah took a covenant from the Prophets; “If I give you the Book and knowledge and the (promised) Noble Messenger (Prophet Mohammed – peace and blessings be upon him) comes to you, confirming the Books you possess, you shall positively, definitely believe in him and you shall positively, definitely help him”; He said, “Do you agree, and accept My binding responsibility in this matter?” They all answered, “We agree”; He said, “Then bear witness amongst yourselves, and I Myself am a witness with you.”