People of the Book, go not beyond the bounds in your religion, and say not as to God but the truth. The Messiah, Jesus son of Mary, was only the Messenger of God, and His Word that He committed to Mary, and a Spirit from Him. So believe in God and His Messengers, and say not, ‘Three.’ Refrain; better is it for you. God is only One God. Glory be to Him — That He should have a son! To Him belongs all that is in the heavens and in the earth; God suffices for a guardian.
Holy Quran 4:171 (translation by Arberry)