The Messiah is someone that King David calls his Lord
41 Jesus said to them, ‘Why do people say that the Messiah will be King David's son? 42 David himself said this in the book called Psalms:
“The Lord God said to my Lord,
Sit at my right side until I beat your enemies completely.
43 You will even be able to put your feet on them.”
44 You see here that David calls the Messiah his Lord. So can you really say that he is just David's son?’