Exodus 6:29 in the King James Version
That the LORD spake unto Moses, saying, I am the LORD: speak thou unto Pharaoh king of Egypt all that I say unto thee.
Context
28 On the day when the LORD spoke to Moses in the land of Egypt,
29 The LORD said to Moses, “I am the LORD. Tell Pharaoh king of Egypt all that I tell you.”
30 Moses said before the LORD, “Behold, I am of uncircumcised lips, and how shall Pharaoh listen to me?”