Isaiah 48:12 "Listen to Me, O Jacob, even Israel whom I called;
I am He, I am the first, I am also the last.
13 "Surely My hand founded the earth,
And My right hand spread out the heavens;
When I call to them, they stand together.
Note: The speaker makes it abundantly clear that He is God Himself.
14 "Assemble, all of you, and listen!
Who among them has declared these things?
The LORD loves him; he will carry out His good pleasure on Babylon,
And His arm will be against the Chaldeans.
15 "I, even I, have spoken; indeed I have called him,
I have brought him, and He will make his ways successful.
16 "Come near to Me, listen to this:
From the first I have not spoken in secret,
From the time it took place, I was there
And now the Lord GOD has sent Me, and His Spirit."
There you have it: Old Testament Trinity... though not understood fully until Jesus revealed Himself. The speaker is God and yet the Lord God sent Him and His Spirit. This theology is affirmed in the Gospel of John:
John 1:1 In the beginning was the Word, and the Word was with God, and the Word was God.
2 He was in the beginning with God.
3 All things came into being through Him, and apart from Him nothing came into being that has come into being.
4 In Him was life, and the life was the Light of men.
5 The Light shines in the darkness, and the darkness did not comprehend it.
Thanks
The speaker is clearly Isaiah himself.
Many times in the book of Isaiah God speaks though Isaiah then Isaiah speaks as well. The prophet was sent by God, given the power of the Holy Spirit to preach repentance to Israel.
No where in that chapter is the Trinity found. The Trinity is a pagan theology that came from that abomination called the council of Nicea. It has corrupted the true meaning of the Father and his son Jesus.
As to your second quote. The word "Word" is from the Greek Logos.
It means the plan of God. Thus John is telling his readers that the plan of God was with God from the beginning. Thus he goes on and says that the word/logos/plan of salvation for mankind was made flesh with the birth of Jesus.
In addition calling the plan of God, the logos "him" is like calling a table "he".It makes no sense. Thus the true translation of your verses should read
2 It was in the beginning with God. 3 All things came into being through it, and apart from it nothing came into being that has come into being. 4 In it was life, and the life was the Light of men. 5 The Light shines in the darkness, and the darkness did not comprehend it.