Luke 1:35, 37 "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.'" "For with God nothing will be impossible." (NKJV)
These verses reveal the Godhead in association at our Lord's birth - the three Persons are revealed:
The Father - "For with God nothing is impossible". The Holy Spirit - "The Holy Spirit will come upon you, and the power of the Highest will overshadow you." The Son - "that Holy One who is to be born will be called the Son of God."
He was called what He was and is (Micah 5:2; John 1:1,2; Hebrews 1:5-6 ). We have the clear revelation of the Trinity at the incarnation of the Lord Jesus.
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.'" (NKJV)
The Father speaks from heaven - the Spirit descends from heaven - the Son is baptised on earth. At Jordan, each member of the Trinity is presented as a distinct Person (Mark 1:10-11; Luke 3:21-22; John 1:32-34 ).
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." (NKJV)
The Lord teaches in John 14:16-26 and leaves no doubt as to three distinct Persons in the Godhead. John 14:26 is the most striking of the grouping of the Trinity as equals. The Lord spoke not only of His own work, but the Father's work, and the work of the Spirit (John 5:17 ). This also implies distinct Personalities.
John 12:28 "'Father, glorify Your name.' Then a voice came from heaven, saying, 'I have both glorified it and will glorify it again.'" (NKJV)
Acts 13:2 "As they ministered to the Lord and fasted, the Holy Spirit said, 'Now separate to Me Barnabas and Saul for the work to which I have called them.'" (NKJV)
John 17:4 "I have glorified You on the earth. I have finished the work which You have given Me to do." (NKJV)
The Father says "I..." - the Son says "I..." - the Spirit says "I...". The Father, Son, and the Holy Spirit are three distinct Persons. These Persons address one another - The Father says "You" to the Son (Mark 1:11 ). The Son says "You" to the Father (John 17:2 ). The Father and the Son use the words "He" and "Him" in reference to the Spirit (John 14:26; 15:26 ).
John 3:35 "The Father loves the Son, and has given all things into His hand." (NKJV)
Divine love flows in the Trinity. The Father loves the Son (John 3:35; 17:23-26 ). The Son loves the Father (John 14:31 ). The Spirit testifies to the Son (John 15:26 ). The Son demonstrated by obedience that He loved the Father (John 14:31 ). Before the world was, God is love (1 John 4:10 ). The Lord Jesus speaks of the Father's love for Him before the creation of the world (John 17:24 ).
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," (NKJV)
These are the words of the risen Lord. They clearly witness and announce the Trinity. Israel had worshipped the one true God using the revered name of Jehovah. Christians are to worship and serve the same almighty Sovereign, under the name of the Father, Son and Holy Spirit. Three Persons in a unity of essence. The baptism of each new believer testifies to faith in the one triune Godhead. The epistles fully uphold the Trinitarian concept of God. Look up these examples:- (Romans 1:3-4; Romans 8:9; 1 Corinthians 12:3; 2 Corinthians 1:21-22; Galatians 4:6; 2 Thessalonians 2:13; 1 Timothy 3:16; Titus 3:4-6; Hebrews 9:14; 1 Peter 1:2 ).
2 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." (NKJV)
This great benediction declares the three Persons in the Godhead and attributes to each, one of the redemptive blessings flowing to us, grace, love, and fellowship. This full apostolic blessing is alone sufficient to prove the doctrine of the Trinity.