The psalmist wrote that he heard a conversation between Yahweh and David's Master. Clearly this distinguishes two members of the Godhead. LORD (Yahweh) refers to God the Father and Lord (adonay) refers to God the Son, the Messiah or Anointed of God. Yahweh commanded Messiah to sit at His right hand, the traditional place of power and authority. He was to do so until Yahweh would subjugate Messiah's enemies (cf. Josh. 5:14). Then Yahweh would permit Messiah to rule over them (cf. 2:8-9; 1 Cor. 15:25).
Jesus Christ quoted verse 1 to prove that He was not only David's descendent but the Messiah of whom David wrote (Mark 12:35-37; cf. Matt. 22:44; Luke 20:42). Peter and the writer of the epistle to the Hebrews also quoted it to prove the deity of Jesus (Acts 2:34-36; 5:30-31; Heb. 1:13; 10:11-13).
"So this single verse displays the divine Person of Christ, His power and the prospect before Him. Together with verse 4 it underlies most of the New testament teaching on His glory as Priest-King."180
