Of peace offerings.
“And they shall offer of the victim of peace offerings a sacrifice to the Lord: the fat and the whole rump.” (Leviticus 3:9)
A good work carried out to its completion becomes a perfect offering.
“The law commands that the tail of the victim is to be offered in sacrifice. Now the tail is the end of a body, and that person makes a perfect offering who carries out the sacrifice of a good work to its due completion.” – St. Gregory The Dialogist
