Pahlavi Texts, Part III (SBE24), E.W. West, tr. , at sacred-texts.com
1. The eighty-sixth subject is this, that it is not proper to kill a beaver 4; but, if they see it in any place, it is necessary to take it up and carry it to running water. 2. For, in the commentary of the Vendîdâd it is ranked 5 as a great sin for the killer 6; and, as to every one who kills a beaver, the source of his seed becomes exhausted.
350:4 Literally 'a water dog.'
350:5 B29 has 'decreed.'
350:6 As shown by the excessive atonements prescribed in Vend. XIV, in default of which he is said to go to hell till the resurrection.