Leviticus 3

Leviticus 3:9

Gregory the Dialogist: And by the precept of the law, the tail of the victim is commanded to be offered in sacrifice. In the tail, of course, is the end of the body; and he sacrifices well who brings the sacrifice of a good work to the end of the required action. — 40 Homilies on the Gospels (Homily 25)