Exodus 6:6-7

Therefore, say to the children of Israel, ‘I am the LORD, and I will bring you out from under the burdens of the Egyptians, and I will free you from their bondage. I will redeem and rescue you with an outstretched (vigorous, powerful) arm and with great acts of judgment [against Egypt]. 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 redeemed you and brought you out from under the burdens of the Egyptians.