The Hebrew noun gerah carries two distinct but related meanings in different contexts: (1) the cud — partially digested food that ruminants bring back up to chew again; and (2) the gerah — the smallest unit of weight in the Hebrew system, equal to 1/20 of a shekel, used in sacred offerings.
As the unit of weight, the gerah appears most significantly in the laws governing the sanctuary shekel and sacred tribute. Exodus 30:13 establishes the standard: 'Each one who crosses over to those already counted is to give a half shekel, according to the sanctuary shekel, which weighs twenty gerahs.' Every Israelite male was required to give this half-shekel as a ransom for his life — the same amount, regardless of wealth or poverty. As the cud, gerah defines part of the clean/unclean distinction in Leviticus 11: animals that chew the cud and have split hooves are clean; those that have one but not the other are unclean. The camel chews cud but does not have split hooves (unclean); the pig has split hooves but does not chew cud (unclean). This distinction, seemingly arbitrary to modern readers, taught Israel the importance of complete holiness — not a partial conformity but full alignment with God's standard.