Exodus 6:10-12

American Standard Version

¹⁰ And Jehovah spake unto Moses, saying, ¹¹ Go in, speak unto Pharaoh king of Egypt, that he let the children of Israel go out of his land. ¹² And Moses spake before Jehovah, saying, Behold, the children of Israel have not hearkened unto me; how then shall Pharaoh hear me, who am of uncircumcised lips?