pe.ter denotes an offspring identified by opening the womb, especially where that status brings consecration, redemption, or substitution.

The attested use identifies the offspring that opens a womb. In the supplied passages, that designation occurs in instructions concerning animals and sons, their being set apart or redeemed, and the Levites being taken in place of Israel's womb-opening offspring.

1. Womb-opening offspring · dominant

   The construct noun marks the one associated with opening a womb: in Exodus 13:12 the APB renders the clause “every firstborn that opens the womb,” extending it to animal offspring, while Exodus 13:2 includes both human and animal womb-openers as belonging to God. In Numbers 18:15 the same designation covers man and animal in a context of presentation and redemption; Numbers 3:12 names those among Israel for whom the Levites are taken.

   Exodus 13:12Exodus 13:2Exodus 34:19Numbers 18:15Numbers 3:12Ezekiel 20:26

In the Anselm Project Bible: Across these verses the APB commonly presents the relevant clauses with “firstborn” and wording about one that “opens the womb,” including animals and sons. Because the APB is a whole-verse translation, those English expressions indicate the clause's presentation rather than a fixed one-to-one rendering.