The LORD says to my Lord: “Sit at my right hand until I make your enemies a footstool for your feet.” The LORD will extend your mighty scepter from Zion; you will rule in the midst of your enemies. Your troops will be willing on your day of battle. Arrayed in holy majesty, from the womb of the dawn you will receive the dew of your youth. The LORD has sworn and will not change his mind: “You are a priest forever, in the order of Melchizedek.” The Lord is at your right hand; he will crush kings on the day of his wrath. He will judge the nations, heaping up the dead and crushing the rulers of the whole earth. He will drink from a brook beside the way; therefore he will lift up his head. (NIV)
The writer of Hebrews refers to this psalm in Hebrews chapters six and seven. The Lord referred to this verse three times in the gospels (Matthew 22:44, Mark 12:36, Luke 20:42). He also warned the Jews that in the future you will see the Son of Man sitting on the right hand of God and coming on the clouds of heaven (Matthew 26:64 and Mark 14:62). Peter in Act chapter two and the author of Hebrews in chapter one refers to this psalm when addressing the work of Christ. The Lord used this psalm to redirect the Pharisees answer to his question “What do you think of Christ? Whose son is he?” When they answered “the son of David”, he referred them to this psalm, which he accredited to David. His question was “How is it then that David speaking by the Spirit calls him Lord? If then David called him ‘Lord’ how could he be his son?” To this, they could not answer him a word, nor did they ask him any more questions. Christ reference to this psalm was during his last week on this earth right before his death when his authority was questioned. In Matthew 26:24 Christ states “The Son of Man will go just as it is written about him” and in Act chapter two Peter preaches that Christ is the one written about in this psalm.
Two facts to remember about this psalm: the Lord will judge the nations; however, He also has the role of priest after the order of Melchizedek. In I John 2:2 John writes of his actions in this position as being the propitiation for the sins of the whole world. So read this psalm in relationship to Psalm two and “kiss the Son, lest he becomes angry and you perish in the way, for his wrath may kindle in a moment. Blessed are all who take refuge in Him.”