'Says the Lord' in the Bible

You shall tell Pharaoh, 'Thus says the LORD, Israel is my son, my firstborn,

Thus says the LORD, "In this you shall know that I am the LORD. Behold, I will strike with the rod that is in my hand on the waters which are in the river, and they shall be turned to blood.

He said to them, "Thus says the LORD, the God of Israel, 'Every man put his sword on his thigh, and go back and forth from gate to gate throughout the camp, and every man kill his brother, and every man his companion, and every man his neighbor.'"