Midrash for Chullin 99:7
אמר רב אויא
R'Jannai likewise said in the name of an elder, One must scrape away a little from the surface thereof.
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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