Exodus 6:12

Overview - Exodus 6
God renews his promise by his name JEHOVAH.
Moses vainly attempts to encourage the Israelites.
10 He and Aaron are again sent to Pharaoh.
14 The genealogy of Reuben, of Simeon, and of Levi, of whom came Moses and Aaron.
26 The history resumed.
Treasury of Scripture Knowledge

Exodus 6:12  (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?

9 ; 3:13 4:29-31 5:19-21

The italics shew that this word has been supplied by our translators; hence it may be inferred by some that Moses was uncircumcised. The difficulty is in some measure cleared away, by using the word uncircumcised in the sense of unsuitable or incapacitated, see ver. 30, ; which agrees with ch. 4:10 where Moses complains of want of eloquence; but by substituting is for am in this place, the connection with the former part of the verse is preserved; "For if the chosen seed, the circumcised sons of Jacob, refuse to hear me," as though Moses had said, "how can I expect to make uncircumcised Pharaoh pay attention to me?"
30 ; 4:10 Leviticus 26:41 ; Deuteronomy 30:6 ; Isaiah 6:5 ; Jeremiah 1:6 ; 6:10 9:26 Acts 7:51