'Says the Lord' in the Bible

“Go and say to My servant David, ‘Thus says the Lord, “Are you the one who should build Me a house to dwell in?

“Now therefore, thus you shall say to My servant David, ‘Thus says the Lord of hosts, “I took you from the pasture, from following the sheep, to be ruler over My people Israel.

Nathan then said to David, “You are the man! Thus says the Lord God of Israel, ‘It is I who anointed you king over Israel and it is I who delivered you from the hand of Saul.

Thus says the Lord, ‘Behold, I will raise up evil against you from your own household; I will even take your wives before your eyes and give them to your companion, and he will lie with your wives in broad daylight.