2 Corinthians 11:6 But though I am unskilled in speech, yet I am not unskilled in knowledge. No, in every way we have been revealed to you in all things. (WEB NAS RSV)
Hebrews 5:13 For every one that partakes of milk is unskilled in the word of righteousness, for he is a babe; (DBY YLT RSV)
Exodus 6:12 Moses spoke before Yahweh, saying, "Behold, the children of Israel haven't listened to me. How then shall Pharaoh listen to me, who am of uncircumcised lips?" (See NAS)
Exodus 6:30 Moses said before Yahweh, "Behold, I am of uncircumcised lips, and how shall Pharaoh listen to me?" (See NAS)