Midrash for Chullin 99:18
גמירי חבריא דרבי אבא מרבי אבא ומנו רבי זירא
After these [three days], even if he arrives from a place nearby, he must count the days of mourning for himself.
Sifrei Devarim
Abba Channan says in the name of R. Eliezer: The shesuah is a beast in itself; it has two backs and two spines.
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