4:171
O People (of) the Book! (Do) not commit excess in your religion and (do) not say about Allah except the truth. Only the Messiah, Isa, son (of) Maryam, (was) a Messenger (of) Allah and His word which He conveyed to Maryam and a spirit from Him. So believe in Allah and His Messengers. And (do) not say, "Three;" desist (it is) better for you. Only Allah (is) God One. Glory be to Him! That He (should) have for Him a son. To Him (belongs) whatever (is) in the heavens and whatever (is) in the earth. And sufficient (is) Allah (as) a Disposer of affairs.