אמר אל אהרן נטה את מטך והך את עפר הארץ והיה לכנים
Say to Aharon, “Stretch out your staff and strike the dust of the land; it shall become lice. (8:12)
Rashi explains that Moshe Rabbeinu could not bring the plague of lice on Egypt, because it meant striking the ground, something Moshe could not bring himself to do. The dust of the earth protected him from being discovered when he used it to conceal the corpse of the Egyptian whom he had killed. For Moshe to have struck the land would have been a blemish on his attribute of hakoras hatov, gratitude. Chazal teach that whoever denies the favor he benefitted from his fellowman will not stop there. He will also one day deny Hashem’s favor as well. One whose…