Matthew 22:41-46 NIV
While the Pharisees were gathered together, Jesus asked them,  “What do you think about the Messiah? Whose son is he?” “The son of David,” they replied.  He said to them, “How is it then that David, speaking by the Spirit, calls him ‘Lord’? For he says,  “ ‘The Lord said to my Lord: “Sit at my right hand until I put your enemies under your feet.” ‘  If then David calls him ‘Lord,’ how can he be his son?”  No one could say a word in reply, and from that day on no one dared to ask him any more questions.
It’s a little easy to get tied up in knots reading this passage! I think what Jesus is saying is that the Messiah that they’re expecting is more than just a descendent of King David, but greater even than he, Israel’s greatest king. It raises the question, if he’s not David’s son, whose son is he?…
Jesus, Messiah, God’s own Son, like David we call you Lord.