Exodus 6:12 in the King James Version
And Moses spake before the LORD, saying, Behold, the children of Israel have not hearkened unto me; how then shall Pharaoh hear me, who am of uncircumcised lips?
Context
11 “Go in, speak to Pharaoh king of Egypt, that he let the children of Israel go out of his land.”
12 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?”
13 The LORD spoke to Moses and to Aaron, and gave them a command to the children of Israel, and to Pharaoh king of Egypt, to bring the children of Israel out of the land of Egypt.