Gezara Shava Aleh Aleh tells us that Aerva and Tzara are Usser to Yiboam.
Reasons why to think Aerva and Tzaras Aerva could do Yiboam.
Hoeil D’ Ishtari Ishtari.
1.Only when “Dead brother” married “live brother’s” (future) wife’s sister then died and then “live brother” married sister of “dead brother’s” wife.
.Hekesh D’Rebbe Yona– learn all Arios from Eishes Ach.
1.Why Revina was Makish to learn all the Shaar Arios to Achos Eisha and not like Rebbe Yona to Eishes Ach.
Two possible reasons.
1.better to make Hekesh to Chumra than to Kula.
2.better to make Hekesh of two Issurim to two Issurim.
Rava– Aerva is Pashut that it’s Usser in Yibaom and never needed a Pasuk only Tzaras Aerva needs a pasuk.
.Why pashut that it’s Usser because Ese can’t be doche Lo Tase Sel Kares.
Rebbe holds that both Aerva and her Tzara need pasukim to Usser them.
1.Drosha of Lokcha ussers Tzaras Aerva and Drosha of Yovma ussers Aerva.
2.Rava holds that both of these droshas are going on Tzaras Aerva.
One tells us that she’s Usser B’Mukom Mitzvas Yiboam and one tells us that she’s Moutter S’Lo B’Mukom mitzvas Yiboam.
Second Pashat in Rava-
both Tzara and Aerva don’t need pusuk to Usser them.
it’s pashut because Tzror equates Tzara to Aerva herself.
Aleh Aleh is really just coming to tell us that Tzaras Aerva is Usser B’mukom Yiboam and muetter elsewhere- where? S’Lo B’Mukom Yiboam.
Learns from Tzror- word is plural and implies that two people are Usser. L’ Galos Aervasa is singular and implies that the Tzara alone is Muetter S’Lo B’Mukom Yib0am.