Why Did David Call Him "Lord"?

In confronting the Pharisees, Jesus often “questioned” them for the purpose of teaching them the truth (John 17:17). We find one such example in Matthew 22:41-46.

After our Lord asked the Pharisees who the coming Messiah would be descended from, they correctly answered “The son of David” (vs. 42).

Jesus then asked them a follow-up question, “How then doth David in spirit call him Lord saying, The Lord said unto my Lord, Sit thou on my right hand till I make thine enemies thy footstool?” (vs. 43-44).

See here.

—Mike Riley, Gospel Snippets