Thus they provoked him to anger with their inventions,.... Sin is an invention of man's: when our first parents sinned, they found out many inventions; and their posterity ever since have been inventors of evil things; and man's invention is very quick at that work. All false doctrine and false worship are of men's finding out; all idolatrous practices are their inventions, and which are here intended; see Psa 106:39. And these are very provoking to God, who is jealous of his glory, and which is taken from him hereby; and even when he forgives such sins of men, he takes vengeance on their inventions, as in this case, Psa 99:8. For it follows: and the plague brake in upon them: like an inundation of water, and carried off four and twenty thousand persons, Num 25:9.