11 And Moses said unto God, Who am I, that I should go unto Pharaoh, and that I should bring forth the children of Israel out of Egypt? 12 And he said, Certainly I will be with thee; and this shall be a token unto thee, that I have sent thee: When thou hast brought forth the people out of Egypt, ye shall serve God upon this mountain.
Moses had just been called by God to do a wonderful thing, but his response shows great hesitancy. This is interesting, because previously Moses had sprung into action on a whim to save a slave being beaten. Now he shows caution and doubt. Perhaps Moses was only able to be brave when caught in the spirit of the moment, or perhaps the years and disappointments had tempered his fire. In either case, he suggests to God that he should not be the one used to save the people of Israel. He has no faith in himself.
God, however, doubles down on the calling. In fact, He goes further, giving a vision of Moses’s future success. God assures Moses that one day he and all the Israelites will stand together in this very mountain, free from the Egyptians and serving the Lord together. This seems an impossible feat, or at least one that would occur slowly, over the passing of many generations, but God says that Moses will see it with his own eyes.
This promise is terrific, and as we will see in the next verse, it seems to give Moses a moment of courage.