They departed from Rameses Whither they repaired, by order of Moses, from all parts of the land. Upon their gods Either their princes and rulers, who are sometimes called gods in Scripture; for God slew the firstborn, not only of the meaner sort, but even of their king and princes: or, their false gods, those beasts which the Egyptians worshipped as gods; for the firstborn of men and beasts were then killed. Probably their images also were thrown down, as Dagon afterward before the ark.
Related Commentaries of Numbers 33:3
Numbers 33:3-4
3 And they departed from Rameses in the first month, on the fifteenth day of the first month; on the morrow after the passover the children of Israel went out with an high hand in the sight of all the Egyptians.
4 For the Egyptians buried all their firstborn, which the LORD had smitten among them: upon their gods also the LORD executed judgments.