Jews for Jesus: Is the Trinity in the Hebrew Scriptures?
Logos: The Jewish Trinity and Why the Old Testament Is a Bridge to Faith
One for Israel: THE TRINITY: EASY AS 1, 2, 3?

Psalm 110:1
The LORD says to my Lord:
“Sit at My right hand
Until I make Your enemies a footstool for Your feet.”

Isaiah 9:6
For a Child will be born to us, a Son will be given to us;
And the government will [fn]rest on His shoulders;
And His name will be called Wonderful Counselor, Mighty God,
Eternal Father, Prince of Peace.

Isaiah 48:16
“Come near to Me, listen to this:
From the beginning 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.”

Zechariah 2:10-11
“Sing and rejoice, O daughter of Zion, for behold, I come and I will dwell in your midst, declares the Lord.
And many nations shall join themselves to the Lord in that day, and shall be my people.
And I will dwell in your midst, and you shall know that the Lord of hosts has sent me to you.”