Click here to read PSALM 110 in poetic form.
Background
Psalm 110 is in the Deuteronomy Book of the Psalms (Psalms 107-150). These 44 Psalms, like the Book of Deuteronomy in the Old Testament, show God’s Word as the source of salvation, deliverance, and healing. This would be fully carried out in the life of the coming Messiah, the living Word, Jesus Christ. Psalm 110 declares the Messiah as prophet, priest, and king. Jesus Christ fulfilled all these prophecies. God prophetically foretold that the coming Messiah would be a prophet like Moses, a priest like Melchizedek, and a king like David. Jesus Christ was all three!
The Gospel of Matthew shows Jesus as the Messiah, the great King. It begins with John the Baptist preparing the way for him, his baptism with holy spirit, his temptation in the wilderness, and then shows him declaring his kingdom in 4:12—7:29. Much of this declaration is in what is called the “Sermon on the Mount.” 
We have seen 
Some people are confused about who the Messiah would be. Who did the Judeans in Jesus’ time think that the Messiah would be? They knew the promised savior would be God’s Son who would save the world. 
We have seen that Jesus said he was what the scriptures promised he would be: the seed of the woman who would crush the serpent’s head, the Son of God, the anointed one, the Messiah. Religious leaders tried to kill him NOT because he said he was God, but because he claimed to be the Messiah. This was blasphemy to them. Now we will see how the Old Testament, specifically the Book of Psalms, spoke of the Messiah. This promised redeemer was not God, but His Son. 
The entire Bible is a tapestry of truth that shows the basics of life and also the details of how things work. Man has basic needs: security, sustenance, and enjoyment. God provides all three. But the Devil has tricked people into going to him for the basics. This always leaves the seeker hurt, incomplete, and lifeless. 