MB: “The OT does not have any sort of personages of God - the Jews never conceived of their Messiah as their deity. It was God - Yahweh, Jehovah - but as a single entity with a single perception by men.”
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On the contrary....
Psalm 2
1 Why do the nations conspire
and the peoples plot in vain?
2 The kings of the earth take their stand
and the rulers gather together
against the LORD
and against his Anointed One.
3 “Let us break their chains,” they say,
“and throw off their fetters.”
4 The One enthroned in heaven laughs;
the Lord scoffs at them.
5 Then he rebukes them in his anger
and terrifies them in his wrath, saying,
6 “I have installed my King
on Zion, my holy hill.”
7 I will proclaim the decree of the LORD :
He said to me, “You are my Son ;
today I have become your Father.
8 Ask of me,
and I will make the nations your inheritance,
the ends of the earth your possession.
9 You will rule them with an iron scepter ;
you will dash them to pieces like pottery.”
10 Therefore, you kings, be wise;
be warned, you rulers of the earth.
11 Serve the LORD with fear
and rejoice with trembling.
12 Kiss the Son, lest he be angry
and you be destroyed in your way,
for his wrath can flare up in a moment.
Blessed are all who take refuge in him.
The OT Son of God refers to men only, such as David, or angels. Not God Himself. Never does that occur.