Further notes from Calvin’s commentary on this Messianic psalm:
1 The Lord said unto my Lord, Sit thou at my right hand, until I make thine enemies thy footstool.
2 The Lord shall send the rod of thy strength out of Zion: rule thou in the midst of thine enemies.
3 Thy people shall be willing in the day of thy power, in the beauties of holiness from the womb of the morning: thou hast the dew of thy youth.
4 The Lord hath sworn, and will not repent, Thou art a priest for ever after the order of Melchizedek.
5 The Lord at thy right hand shall strike through kings in the day of his wrath.
6 He shall judge among the heathen, he shall fill the places with the dead bodies; he shall wound the heads over many countries.
7 He shall drink of the brook in the way: therefore shall he lift up the head.
Christ applies the first verse to himself in his incisive question to the Pharisees in Matthew 22:42-45. The author of Hebrews also quotes it in Hebrews 1:13 to prove Christ’s superiority over the angels. Jehovah said to Adon (my lord).
The Lord at God’s right hand must be understood of Messiah in regal power ruling from Zion (heaven) to where he ascended as Peter affirms quoting this verse in Acts 2:34-35.
In the day of his power (effectual calling) all his chosen people will spontaneously and cheerfully consecrate themselves to his service. The race that will be born by him and for him will be like dew-drops innumerable.
God never allowed the blending of priest and king among his people till Christ came and his priesthood would be for ever because he lives forever unlike the Levites who died.
The dreadful nature of the power which Christ possesses (v5) is seen in the dispersion and destruction of all his enemies. Figuratively he shall only pause to drink by a stream to renew his strength in the pursuit of his foes. The gentle caring shepherd among his flock, is fierce and formidable towards wolves and thieves. Let us never provoke his wrath by obstinacy and a rebellious spirit.