Exodus 6:5-7

Furthermore I have heard the groaning of the sons of Israel, because the Egyptians are holding them in bondage, and I have remembered My covenant. Say, therefore, to the sons of Israel, ‘I am the LORD, and I will bring you out from under the burdens of the Egyptians, and I will deliver you from their bondage. I will also redeem you with an outstretched arm and with great judgments. Then I will take you for My people, and I will be your God; and you shall know that I am the LORD your God, who brought you out from under the burdens of the Egyptians.