'Says the Lord' in the Bible

A man of God came to Eli, and said to him, "Thus says the LORD, I plainly revealed myself to the house of your father, when they were slaves in Egypt to the house of Pharaoh.

and he said to the children of Israel, "Thus says the LORD, the God of Israel, 'I brought up Israel out of Egypt, and I delivered you out of the hand of the Egyptians, and out of the hand of all the kingdoms that oppressed you:'

Thus says the LORD of hosts, 'I have marked that which Amalek did to Israel, how he set himself against him in the way, when he came up out of Egypt.