Exodus 6:30

But Moses said to the Lord , Behold, I am of uncircumcised lips . How will Pharaoh listen to me?

But Moses said to the Lord, “Since I speak with faltering lips, why would Pharaoh listen to me?”

And Moses said before the Lord, Behold, I am of uncircumcised lips, and how shall Pharaoh hearken unto me? Exodus 5 Books Exodus 7