Exodus 6:9

Therefore tell the children of Israel, ‘I am the LORD, and I will bring you out from under the burdens of the Egyptians, and I will rid you out of their bondage, and I will redeem you with an outstretched arm, and with great judgments.

I will take you to myself for a people. I will be your God; and you shall know that I am the LORD your God, who brings you out from under the burdens of the Egyptians.

I will bring you into the land which I swore to give to Abraham, to Isaac, and to Jacob; and I will give it to you for a heritage: I am the LORD.’”

The LORD spoke to Moses, saying,

“Go in, speak to Pharaoh king of Egypt, that he let the children of Israel go out of his land.”

Moses spoke before the LORD, saying, “Behold, the children of Israel haven’t listened to me. How then shall Pharaoh listen to me, when I have uncircumcised lips?”