Exodus:6:28-12
nkjv@Exodus:6:28 @ And it came to pass, on the day the LORD spoke to Moses in the land of Egypt,
nkjv@Exodus:6:29 @ that the LORD spoke to Moses, saying, "I am the LORD. Speak to Pharaoh king of Egypt all that I say to you."
nkjv@Exodus:6:30 @ But Moses said before the LORD, "Behold, I am of uncircumcised lips, and how shall Pharaoh heed me?"