In his address to devout Jews "from every nation under heaven" on Pentecost Day, Peter explained Psalm 110:1 in this way:
Acts 2:34-36
For David did not ascend into the heavens, but he says himself:
YHWH said to my Master,
“Sit at My right hand,
Till I make Your enemies Your footstool.”
Therefore let all the house of Israel know assuredly that GOD HAS MADE this Yeshua, whom you crucified, both Master and the Anointed One.