הלכה על במדבר 25:7

To give the foreleg, the jaw and the maw to the priest: That Israel was commanded to give the foreleg, the jaw, and the maw from all pure, slaughtered animals to the priest. And about this was it stated (Deuteronomy 18:3), "This shall be the statute of the priests, etc." The Sages, of blessed memory, already said (Chullin 134b) about the reason for this commandment that it was in the merit of Pinchas, their father - who was zealous on behalf of his God with regard to the matter of Kozbi, and [was prepared to] surrender his life for the sanctification of [God's] name, to kill a prince from a tribe of Israel - that his children, the priests, merited this present from God forever: The foreleg - corresponding to, "and he took a spear" (Numbers 25:7); the jaw - in the merit that he prayed for the anguish of Israel, as it is written, "And Pinchas stood up and prayed" (Psalms 106:30); and the maw - corresponding to, "and the woman into her stomach" (Numbers 25:8). And we learn from this that one who openly sanctifies the name of Heaven - he and his descendants attain merit in this world, aside from his merit which is kept eternally for his soul in the World to Come.