申命記 15:20的米示拿參照：Mishnah Bekhorot

For how long is an Israelite bound to take care of a first born? In the case of small cattle, for thirty days, and large cattle, fifty days. Rabbi Yose says: in the case of small cattle, three months. If the priest says [to the Israelite] during this period “Give it to me,” he must not give it to him. But if the first born was blemished and the priest said to him “Give it to me so that I may eat it,” then it is allowed. And in Temple times, if [the first born] was in an unblemished state and the priest said to him “Give it to me, and I will offer it up it was allowed.” A first born is eaten year by year both in an unblemished as well as in a blemished state, for it is said: “You shall eat it before the Lord your God year by year” (Deuteronomy 15:20).