Ruh

The triliteral root rā wāw ḥā (ر و ح) occurs in the Quran 57 times.

(2:87) We gave Moses the book, and after him, We sent the messengers. Later We gave Jesus son of Mary the clear proofs, and We supported Him with the Holy Spirit (Arab. بِرُوحِ, birūḥi). Is it that every time a messenger comes to you with what your minds do not desire, you become arrogant? A group of them you deny, and a group of them you kill!

(5:110) God said, "O Jesus son of Mary, recall My blessings upon you and your mother that I supported you with the Holy Spirit (Arab. بِرُوحِ, birūḥi); you spoke to the people in the cradle and in old age; and I taught you the Book and the Philosophy, and the Torah, and the Injeel; and you would create from clay the shape of a bird, then blow into it and it becomes a bird by My leave; and you heal the blind and the leper by My leave; and you brought out the dead by My leave. I have restrained the Children of Israel from you, that you came to them with proofs; but those who rejected amongst them said, "This is an obvious magic!""

(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 (Arab. وَرُوحٌ, warūḥun) from Him. So acknowledge God and His messengers, and do not say, "Trinity." 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.

Angels and the Spirit

(70:4) The angels and the Spirit (Arab. وَالرُّوحُ, wal-rūḥu) ascend to Him in a day which is equivalent to fifty Thousand years.