But in the LORD’s presence Moses replied, “If the Israelites will not listen to me, then why would Pharaoh listen to me, since I am unskilled in speech?”
Jewish Publication Society of America Version (JPS1917) - Exodus 6:12 >And Moses spoke 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?'