The Son of David is the Son of God

The Lord said unto my Lord - In the Hebrew, “Spake Jehovah to my Lord.” The word יהוה Yahweh is the incommunicable name of God. It is never given to a created being. The other word translated “Lord - אדני 'Adonāy - means one who has rule or authority; one of high rank; one who has dominion; one who is the owner or possessor.
In LXX (Septuagint-Hebrew translation to Greek)ὁ κύριος τῷ κυρίῳ
In NT Greek, ὁ Κύριος τῷ Κυρίῳ
In Hebrew, Yehovah said to my Adown.

We preach that:
Jesus is Lord
Jesus is kurios
Jesus is Adown-Adonai
Jesus is Yehovah, Yahweh.
Jesus is God Himself.

Failure to proclaim that Jesus is the God (Elohiym) of the OT, there is NO Salvation, especially in the context of the Gospel.!!

Amein!