“Come near to Me, hear this: I have not spoken in secret from the beginning; from the time that it was, I was there. And now the Lord God and His Spirit have sent Me” (Isaiah 48.16).

Isaiah records the words of the preincarnate Christ in this verse. Jesus, the Son of God, is the speaker here. He is sent by. the Lord God (the Father) and His Spirit (God the Holy Spirit). This is a clear reference to the triunity of God in the Old Testament. This is something that is also reinforced in the New Testament.

God is One God in three persons. The persons are distinct in the New Testament: The Father, the Son, and the Holy Spirit. Luke 1.35 records the words of the angel announcing the conception of the Messiah through Mary: “The Holy Spirit will come upon you, and the power of the Highest (the Father) will overshadow you; therefore, also, that Holy One who is to be born will be called the Son of God.” Jesus began His public ministry at His baptism: “When He had been baptized, Jesus (God the Son) came up immediately from the water; and behold, the heavens were opened to Him, and He saw the Spirit of God (God the Holy Spirit) descending like a dove and alighting upon Him. And suddenly a voice (God the Father) came from heaven, saying, ‘This is My beloved Son, in whom I am well pleased’” (Matthew 3.16-17). Jesus left His disciples with the Great Commission: “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” (Matthew 28.19). 2 Corinthians 13.14 records a benediction prayer: “The grace of the Lord Jesus Christ (God the Son), and the love of God (the Father), and the communion of the (God) the Holy Spirit be with you all. Amen.