על החוקים לפרטיהם, ספר ג כ״דOn the Special Laws, Book III 24

א׳
1[134] Such is the reason which we find suitable to younger ears, but for elders and those whose character is fully developed there is another which may properly be given.  For laymen it may be allowed that it is enough to keep undefiled from voluntary misdeeds only, and anyone who likes may say the same of the other priests, but he must make an exception of the high priest and agree that he needs to be innocent of the involuntary as well as the voluntary.
ב׳
2[135] The contact with pollution of any kind is forbidden to him, whether it is the result of definite purpose or of some movement of the soul which he has not willed, for only so can he take his place as revealer in both aspects, his motives blameless and his life so fortunate that no stigma attaches to it.
ג׳
3[136] It is a necessary consequence that such a one should include in the objects of his displeasure the unintentional homicides, regarding them not indeed as accursed,  but yet not pure or free from sin of every kind, however much they are admitted to have ministered to Nature’s will, who has used them as instruments of vengeance against those who have fallen by their hands, condemned to death in the secret tribunal where she sits as sole judge.