Exodus 6:28

26These are that Aaron and Moses to whom the LORD said, “Bring out the children of Israel from the land of Egypt according to their armies.”

27These are those who spoke to Pharaoh king of Egypt, to bring out the children of Israel from Egypt. These are that Moses and Aaron.

28On the day when the LORD spoke to Moses in the land of Egypt,

29The LORD said to Moses, “I am the LORD. Tell Pharaoh king of Egypt all that I tell you.”

30Moses said before the LORD, “Behold, I am of uncircumcised lips, and how shall Pharaoh listen to me?”