# The Lord said to my Lord

This is a quotation from the book of Psalms which says "Yahweh said to my Lord." But the Jews stopped saying "Yahweh" and often said "Lord" instead. Alternate translation: "The Lord God said to my Lord"

# my Lord

David was referring to the Christ as "my Lord."

# Sit at my right hand

Sitting at the "right hand of God" is symbolic of receiving great honor and authority from God. Alternate translation: "Sit in the place of honor beside me"