I cannot prove the trinity but this I humbly offer.
Isaiah 9:6 “For unto us a child is born, unto us a son is given: and the government shall be upon his shoulder: and his name shall be called Wonderful, Counselor, The mighty God, The everlasting Father, The Prince of Peace.”
Isaiah 63:16 “Doubtless thou art our Father, though Abraham be ignorant of us, and Israel acknowledge us not: thou, O LORD, art our Father, our Redeemer: thy name is from everlasting.”
1Cor. 8:6 “but to us there is but one God, the Father…”
Matthew 1:23 “Behold, a virgin shall be with child, and shall bring forth a son, and they shall call his name Immanuel, which being interpreted is, God with us.” Verse 25 “and knew her not till she had brought forth her firstborn son: and he called his name JESUS.”
Matthew 6:9 “After this manner therefore pray ye: **Our Father ** which art in heaven, Hallowed be thy name.”
John 3:13 “And no man hath ascended up to heaven, but he that came down from heaven, even the Son of man which is in heaven.”
Matthew 28:19 “Go ye therefore, and teach all nations, baptizing them in **the name ** of the Father, and of the Son, and of the Holy Ghost:”
Acts 2:38 “Then Peter said unto them, Repent, and be baptized every one of you in **the name of Jesus Christ ** for the remission of sins, and ye shall receive the gift of the Holy Ghost.”
Acts 4:12 “Neither is there salvation in any other: for there is **none other name ** under heaven given among men, whereby we must be saved.”
2Cor. 3:17 “Now the Lord is that Spirit: and where the Spirit of the Lord is, there is liberty.”
1Tim. 3:16 “And without controversy great is the mystery of godliness: God was manifest in the flesh…”