“Why do thy disciples transgress the tradition of the elders? for they wash not their hands when they eat bread.” The washing in question is netilat yadayim, a ritual pouring of water over the hands before eating bread. It was never about hygiene: it extends to the ordinary table the purity washing the Torah requires of priests before they eat holy food, one more piece of the Pharisaic program to make every table an altar. The Mishnah devotes a whole tractate to it (Yadayim 1:1 opens with the required quantity of water), and observant homes keep the practice before bread to this day.

Jesus answers with a harder case from the same tradition: korban. Property declared korban (“an offering”) was barred from ordinary use as if dedicated to God, and the vow formula could be used to lock a son's goods away from his own parents; the Mishnah records the substitute formulas people spoke (Nedarim 1:2). Jesus weighs that vow against the commandment “honor thy father and mother” and rules that no vow can cancel it. The tradition itself wrestled with the same tension: its vow-release discussions include a debated question about opening a release by appeal to the parents' honor (Nedarim 9:1 records the rabbis divided over exactly that move). Jesus' ruling cuts where the tradition circled.