Charles Ellicott Commentary Acts 2:34

"For David ascended not into the heavens: but he saith himself, The Lord said unto my Lord, Sit thou on my right hand," — Acts 2:34 (ASV)

The Lord said. . . .—There is, when we remember what had happened only seven weeks before, something very striking in St. Peter's reproduction of the very words by which our Lord had brought the scribes to confess their ignorance of the true interpretation of the Psalmist’s mysterious words (Psalms 110:1). (See Note on Matthew 22:44.) Those who were then silenced are now taught how it was that David’s Son was also David’s Lord.