The Son is the Man Who Ascended to the right hand of Yahweh
Hebrews 1:13 (NASB), “But to which of the angels has He ever said, ‘Sit at My right hand until I make Your enemies a footstool for your feet.”
The inspired author of Hebrews cited a portion of Psalm 110:1 to show that Jesus Christ is the one addressed in a prophecy referencing his ascension into heaven. Psalm 110:1 in the Hebrew text shows that Yahweh spoke prophetically to David’s Lord [the Messiah as a “human lord”] saying, “Sit at my right hand until I make your enemies a footstool for your feet.”
“The LORD [Yahweh] says to my Lord [adon]: "Sit at My right hand until I make Your enemies a footstool for Your feet." (Psalm 110:1 NASB)
Notice that the divine name of Yahweh appears in the text for the Most High God Who speaks to another Lord which is the Hebrew noun “adon”. Adon is normally used of human masters and lords throughout the Hebrew Bible, but rarely used to reference the Most High God Himself.
Thus, the normative use of “adon” in the context of being distinguished from Yahweh in Psalm 110:1 indicates that the only true God is our Heavenly Father Who prophetically spoke of his future child born and son given as the human “adon” who would be exalted to his anthropomorphic right hand in the prophetic future.
Acts 2:34-35 proves that Psalm 110:1 is a Messianic prophecy about the ascension of the man Christ Jesus into heaven because the apostle Peter cited Psalm 110:1 to prove that Jesus ascended into heaven in his resurrected body.
“For it was not David who ascended into heaven, but he himself says, ‘The LORD [Yahweh] said to my Lord [adon], Sit at my right hand, until I make your enemies a footstool for your feet.” (Acts 2:34-35)
Here we find through the inspired apostle that Psalm 110:1 refers to the Messiah’s bodily ascension into heaven in which the Son would be exalted to the highest position of authority under God the Father Himself.
We ask our Trinitarian friends how God the Father could have said to a coequally distinct Yahweh God the Son (before the incarnation), “Sit at my right hand,” if the Son was already at the Father’s anthropomorphic right hand to begin with? Therefore we can see that the Son of God is the man who had his beginning by his virgin begetting, whilst the God who became the Son as a true man among men could never have had a time of origin (1 Timothy 3:16; John 8:58; Isaiah 9:6; Matthew 1:18-23).
Yahweh God became a Son in order to Save us
When we read the entire chapter of Psalm 118 in context, we find that Yahweh became our salvation as Jesus by becoming the child born and Son given (Isaiah 9:6).
"This is the gate of Yahweh (Jesus is the door); the righteous will enter through it. I shall give thanks to You, for YOU HAVE BECOME MY SALVATION. The stone which the builders rejected has become the chief cornerstone. This is Yahweh's doing. It is marvelous in our eyes (Psalm 118:20-23)."
Jesus cited Psalm 118:23 (in Matthew 21:42, Mark 12:10-11, and Luke 20:17) referencing himself which proves that Jesus is Yahweh who has become our salvation by His own Holy Spirit who descended upon the virgin to become the Christ child (Luke 1:35).
Therefore Jesus proved that He is Yahweh God incarnate as the Messiah when he said, “Have you not even read this scripture: The stone which the builders rejected, this became the chief corner stone; this came about from the LORD, and it is marvellous in our eyes? And they were seeking to seize him, and yet they feared the people (Mark 12:10-12 NASB) …”
The Pharisees not only perceived that Jesus had spoken the previous parable against them, but were obviously familiar with the context of Psalm 118 which says that Yahweh would become our salvation. Thus, when Jesus cited Psalm 118 about himself, the Pharisees became enraged at Jesus and sought to kill him because they assumed that he had also spoken blasphemy by claiming to be Yahweh Himself.
Therefore the Pharisees could not accept the fact that Jesus is Yahweh who became our salvation as “God with us” (Matthew 1:23) as a true man.