Trinity

The triliteral root thā lām thā (ث ل ث) occurs in the Quran 32 times.

(4:171) O People of the Book, do not overstep in your system, nor say about God except the truth. The Messiah Jesus the son of Mary was no more than God's messenger and the fulfillment of His word to Mary, and an inspiration from Him. So acknowledge God and His messengers, and do not say, "Trinity (Arab. ثَلَاثَةٌ, thalāthatun)." Cease, for it is better for you. God is only One god, be He glorified that He should have a son! To Him is all that is in the heavens and what is in the earth. God is enough as a caretaker.