'Says the Lord' in the Bible

Then a man of God came to Eli and said to him, “Thus says the Lord, ‘Did I not indeed reveal Myself to the house of your father when they were in Egypt in bondage to Pharaoh’s house?

and he said to Israel, “Thus says the Lord, the God of Israel, ‘It was I who brought Israel up from Egypt, and I rescued you from the hand of the Egyptians and from all the kingdoms that were oppressing you.’

Thus says the Lord of hosts (armies), ‘I will punish Amalek for what he did to Israel, how he set himself against him on the way when Israel came up from Egypt.