Exodus 6:5-6

Now I have heard the cries of the Israelites, whom the Egyptians are treating as slaves, and I remember my agreement. So tell the people of Israel that I say to them, ‘I am the LORD. I will save you from the hard work the Egyptians force you to do. I will make you free, so you will not be slaves to the Egyptians. I will free you by my great power, and I will punish the Egyptians terribly.