In "the plague of the first-borns" (makat bechorot), did the first-borns suffer by dying or did their families suffer more?
In Rabbi Yehuda's abbreviations of the ten plagues, d'tzach-adash-b'achav, the abbreviation ends with the Hebrew letter “vet” for bechorot (first-borns), implying that it was the families who suffered, since if it ended with a “mem” for makat bechorot, it would have been the first-borns who suffered.