Sforno on Exodus 3:12/ספורנו על שמות ג׳:י״ב

1כי אהיה עמך וזה לך האות, that you will not only issue decrees but will carry them out successfully wherever you turn. Your very success will convince everyone that I must be the One who has sent you. They will therefore take you and your words very seriously. We find that this did indeed come true in Exodus 11,3 והאיש משה גדול מאד בכל ארץ מצרים, “the man Moses was very great in the whole land of Egypt.”

2בהוציאך את העם ממצרים תעבדון את האלוקים על ההר הזה.. even though they are not worthy of redemption at this time, but they are worthy of serving the Lord at this mountain when you take them out from among these professional sinners.