Qur'an 4:171 "People of the Book, do not go to excess in your religion, and do not say anything about God except the truth: the Messiah, Jesus, son of Mary, was nothing more than a messenger of God, His word, directed to Mary, a spirit from Him.  So believe in God and His messengers and do not speak of a 'Trinity' -- stop [this], that is better for you -- God is only one God, He is far above having a son, everything in the heavens and earth belongs to Him and He is the best one to trust."