The previous verses implied that Mohammad was foretold in the BIBLE and GOSPEL. Here the argument is taken to a general principle that God took a covenant from the prophets as well as their followers that when knowledge and Book was given you, and then there came to you a prophet who confirmed that which was with you, believe in him and help him. Then the matter is emphasized by taking confession: ``Then Allah asked them; Do you acknowledge my covenant and keep it as a binding on you?'' and they affirmed it.