Luke 20:42-44 New English Translation

⁴²For David himself says in the book of Psalms,

‘The Lord said to my^[a] lord,
“Sit at my right hand,
⁴³until I make your enemies a footstool for your feet.”’^[b]

⁴⁴If David then calls him ‘Lord,’ how can he be his son?”^[c]

Luke 20:42 sn The Lord said to my lord. With David being the speaker, this indicates his respect for his descendant (referred to as my lord). Jesus was arguing, as the ancient exposition assumed, that the passage is about the Lord’s anointed. The passage looks at an enthronement of this figure and a declaration of honor for him as he takes his place at the side of God. In Jerusalem, the king’s palace was located to the right of the temple to indicate this kind of relationship. Jesus was pressing the language here to get his opponents to reflect on how great Messiah is.
Luke 20:43 sn A quotation from Ps 110:1.
Luke 20:44 tn Grk “David thus calls him ‘Lord.’ So how is he his son?” The conditional nuance, implicit in Greek, has been made explicit in the translation (cf. Matt 22:45).

New English Translation (NET)