This summary of scriptures relevant to the biblical statements that God is a Triune being, a Trinity, and that the Trinity consists of more than one person will be followed by the actual quotations:
Job 33:4; Matthew 3:16-17, 28:19; Luke 1:35, 3:22; John 14:17, 20-21, 14:26, 15:26; Colossians 2:2; 2nd Corinthians 13:14; 1st Peter 1:2
Job 33:4 “The Spirit of God has made me, and the breath of the Almighty gives me life.”
Matthew 3:16-17 “When He had been baptized, Jesus came up immediately from the water; and behold, the heavens were opened to Him, and He saw the Spirit of God descending like a dove and alighting upon Him, and suddenly a voice came from heaven, saying, ‘This is my beloved son, in whom I am well pleased.’”
Matthew 28:19 “Go therefore and make disciples of all the nations, baptizing them in the name of the Father and of the Son and of the Holy Spirit.”
Luke 1:35 “And the angel answered and said to her, ‘The Holy Spirit will come upon you, and the power of the Highest will overshadow you; therefore, also, that Holy One who is to be born will be called the Son of God.’”
Luke 3:22 “And the Holy Spirit descended in bodily form like a dove upon Him, and a voice came from heaven which said, ‘You are my beloved Son; in you I am well pleased.’”
John 14:17, 20-21 “The Spirit of truth, whom the world cannot receive, because it neither sees Him nor knows Him; but you know Him, for He dwells with you and will be in you_At that day you will know that I am in my Father, and you in me, and I in you.”
John 14:26 “But the Helper, the Holy Spirit, whom the Father will send in my name, He will teach you all things, and bring to your remembrance all things that I said to you.”
John 15:26 “But when the Helper comes, whom I shall send to you from the Father, the Spirit of truth who proceeds from the Father, He will testify of me.”
Colossians 2:2 “in order that they may know the mystery of God, namely, Christ(1).”
NIV Footnote: (1) some manuscripts have: God, even the Father, and of Christ.
2nd Corinthians 13:14 “The grace of the Lord Jesus Christ, and the love of God, and the communion of the Holy Spirit be with you all. Amen.”
Hebrews 9:14, “how much more shall the blood of Christ, who through the eternal Spirit offered Himself without spot to God, cleanse your conscience from dead works to serve the living God?”
1st Peter 1:2 “Elect according to the foreknowledge of God the Father, in sanctification of the Spirit, for obedience and sprinkling of the blood of Jesus Christ: Grace to you and peace be multiplied.”