Vain words Those of Moses and Aaron, which he said were vain, or false; that is, that they falsely pretended that their God had commanded them to go and worship, when it was only a crafty design of their own to advance themselves by raising sedition.
Related Commentaries of Exodus 5:9
Exodus 5:9
9 Let there more work be laid upon the men, that they may labour therein; and let them not regard vain words.