Sanhedrin

Raba said: Come and hear! A male aged nine years and a day who cohabits with his deceased brother's wife [the former having left no issue] acquires her [as wife]. But he cannot divorce her until he attains his majority.  He is defiled through coition with a niddah,  so that he in turn defiles that upon which he lies, as a garment which has lain upon [a person afflicted with gonorrhoea] — He disqualifies [a woman from the priesthood],  but cannot enable a woman to eat [of terumah].  He renders an animal unfit for the altar,  and it is stoned on his account,  and if he had intercourse with one of the degrees forbidden in the Torah, the latter is executed. Now here there is degradation, but no stumbling-block, yet it is taught: 'It is stoned on his account.' Since it was a deliberate offence, there is a stumbling-block, but the All-Merciful One had mercy upon him; now, He showed mercy to him, but not to the animal. Come and hear! ANOTHER REASON IS THAT THE ANIMAL SHOULD NOT PASS THROUGH THE STREETS WHILST PEOPLE SAY, 'THIS IS THE ANIMAL ON ACCOUNT OF WHICH SO AND SO WAS STONED.' Now surely, since the latter reason embraces both stumbling-block and degradation, the former reason refers to degradation only, that is, when a Jew committed bestiality in