Exodus 4:1 - Coke's Commentary on the Holy Bible

Moses answered—behold, they will not believe me— The plain meaning of these words, as is evident from the miracles which God immediately wrought, and gave Moses also power to perform, is, that his bare word would be insufficient to convince the people, without some extraordinary signs to confirm the truth of his mission: "the people will say, the LORD hath not appeared unto thee: if he had, he would certainly have enabled thee to give some sign: shew us therefore such a sign, or we will not believe or regard thy voice." This is so natural an interpretation of the passage, that, I think, it renders useless Bishop Warburton's conjecture, that the backwardness of Moses proceeded from his thinking the recovery of the Israelites, from Egyptian superstition, altogether deliberate.