Verse 42. - And David himself saith in the Book of Psalms, The Lord said unto my Lord, Sit thou on my right hand. The Hebrew runs thus: "Jehovah said to my Lord (Adonai)." The Eternal is represented as speaking to Davids Lord, who is also David's Son (this appears clearer in St. Matthew's account, Matthew 22:41-46). The Eternal addresses this Person as One raised to sit by him, that is, as a Participator in his all-power, and yet this one is also David's Son! The scribes are asked to explain this mystery; alone this can be done by referring to the golden chain of Hebrew Messianic prophecy; no scribe in the days of our Lord would do this. Such passages as Isaiah 9:6, 7; Micah 5:2; and Malachi 3:1, give a complete and exhaustive answer to the question of Jesus.

20:39-47 The scribes commended the reply Christ made to the Sadducees about the resurrection, but they were silenced by a question concerning the Messiah. Christ, as God, was David's Lord; but Christ, as man, was David's son. The scribes would receive the severest judgement for defrauding the poor widows, and for their abuse of religion, particularly of prayer, which they used as a pretence for carrying on worldly and wicked plans. Dissembled piety is double sin. Then let us beg of God to keep us from pride, ambition, covetousness, and every evil thing; and to teach us to seek that honour which comes from him alone.And David himself saith in the book Psalms,.... In Psalm 110:1

the Lord said to my Lord, sit thou on my right hand; which words were delivered by David, as inspired by the Spirit of God; and contain a speech of God the Father to his son Jesus Christ, upon his ascension to heaven, after his sufferings, death, and resurrection from the dead; when he was bid to sit down in human nature, at the right hand of God, in token of having done his work on earth to full satisfaction; and in the relation of which David calls Christ his Lord; and is the reason of their being mentioned.