Was Jesus Christ the Lord God who spoke in the Old Testament?
If Jesus was the Word, the Logos, the Spokesman (John 1:1), and the Implementer (John 1:3) then He must be the One spoken of in Isaiah 66:2a and Isaiah 44:24.
If Jesus Christ is the First and the Last, the Alpha and Omega in Revelation 1:17-18 then He was the Lord in Isaiah 44:6b, Isaiah 48:12.
If Jesus Christ is our Savior like what Titus 1:4b and 3:6 tells us, and then He was the Savior, the Redeemer in Isaiah 43:3, 11, 14. Isaiah 47:4, Isaiah 48:17, Isaiah 49:26b, Isaiah 60:16.
If life and light were in Him and came from Him according to John 1:4, then He was the everlasting light in Isaiah 10:17, Isaiah 60:19, 20.
If Isaiah wrote in 41:4b and 43:10, “I, the LORD…I am he” and Jesus said in John 8:24b (KJV) “…for if ye believe not that I am he, ye shall die in your sins,” then we may surmise that the LORD in Isaiah and Jesus is one and the same. Genesis 3:13-15 gives additional weight to this conjecture.
Genesis 1:26. Then God (Hebrew - Elohim, plural) said, “Let US make man in OUR image, in OUR likeness….
Genesis 1:1 also used the Hebrew plural noun Elohim to indicate that there was a “more than one co-equal Persons” in the Godhead where the Spirit of God is the first to be named as one of those Persons in verse 2 which later identified as the HOLY Ghost or the Holy Spirit elsewhere in the Scripture (cf. John 14:26 and John 15:26)
God, Elohim, or the Co-equal Persons in the Godhead spoke and it was done. Only God can create, hence God is called in particular ktistes and ktizo in Greek and bara in Hebrew meaning the Creator and the Maker.
At this point we may conclude that John 1:1-3 was perfectly translated in original intended meaning that:
1) Jesus was, is and will be God. He is not an insignificant god but Mighty God and Creator. (cf. Isaiah 9:6-7a)
2) Being Co-Equal Persons in the Godhead, Jesus and the Eternal Father are eternally with each other from the past and to the future.
3) Jesus, being the Logos, the Spokesperson of the Godhead, was the One who spoke and things came into being as recorded in the Old Testament. He was with God the Father in the beginning and He (Jesus) was the One who created all things.
4) As identified and described by these verses and elsewhere in the Bible, God is one and there is only one God composed of Co-Equal Persons namely:
a) God or the Eternal Mighty God who became God the Father.
b) Logos, the Word, the Spokesperson who became God the Son and sometimes called Son of man, Jesus the Christ, the Emmanuel, the Messiah, the Anointed One,
c) The Spirit of God, the Holy Ghost or the Holy Spirit. He is also called as the Comforter, the Teacher and the Helper.
John 1:14, 1:18, John 20:27-28, Romans 9:5, Mark 5:6-10, support the deity of Jesus Christ and heavily highlighted in the Book of Titus.
1) God is our Savior (Titus 1:3).
2) …Christ Jesus our Savior (Titus 1:4b). Note that the word Savior is in singular indicating that Jesus is the only Savior provided by God the Father.
3) … while we wait for the blessed hope --- the glorious appearing of our great God and Savior, Jesus Christ (Titus 2:13). Jesus here is called great God and Savior. Note: there is a coma after “great God and Savior” and followed by “Jesus Christ.” It indicates that the writer either tried to specify who really was the great God and Savior or tried to describe who really Jesus Christ was. Jesus Christ was the blessed hope every Israelite was waiting for and the glorious appearing of the Word, the God who “became flesh and lived among us” is confirmed in John 1:14.
4) …God our Savior appeared, he saved us, NOT because of righteous things we have done, BUT because of His mercy (Titus 3:4-5a). See also 2 Timothy 1:9-10.
5) …He saved us through the washing of rebirth and renewal by the Holy Spirit, whom he poured out on us generously through Jesus Christ our Savior (Titus 3:5a-6)
Now we can safely reckon that Jesus Christ is Great God and Savior.