פירוש על עבודה זרה 9:18

The Talmud now offers prooftexts that all of these types of people are regarded as if they are dead. Exodus 4:19 is God’s words to Moses telling him to return to Egypt for all of the people who wished him dead in Egypt are now themselves dead. But according to the midrash, those in Egypt who wished him dead were none other than Datan and Aviram, who later rebel against Moses in the wilderness. They are called here “dead” because they had already lost their property.
The other prooftexts are relatively straightforward. The verse from Numbers is stated by Moses with regard to Miriam who becomes leprous when she speaks out against Moses. The verse from Genesis is stated by Rachel, when she is still childless.