Exodus 6:12 - Exposition

Uncircumcised lips , i.e. "lips inefficient for the purpose for which lips are given;" as "uncircumcised ears" are ears that cannot hearken ( Jeremiah 6:10 ), and an "uncircumcised heart" a heart that cannot understand ( Jeremiah 9:26 ). The meaning is the same as in Exodus 4:10 , where Moses says that he is "slow of speech and of a slow tongue." Nothing can be determined from the expression as to the exact cause of the imperfection of which complaint is made.