be.khor denotes the eldest offspring, identified in genealogies and in rules concerning inheritance, redemption, and judgment.

The term identifies the eldest offspring within a family or group, most often locating a named son in genealogies and family order. The same designation is used of people and animals in instructions concerning inheritance, consecration or redemption, and the judgment on Egypt; it can also be applied to Israel in the statement, “Israel is my son, my firstborn.”

1. Eldest offspring in family, legal, and group settings · dominant

   In genealogical sequences, the singular noun identifies the eldest named son: in 1 Chronicles 3:1 the APB renders Amnon as “the firstborn” before listing the second son, and in Genesis 43:33 it places the eldest according to his birthright and the youngest according to his youth. In Deuteronomy 21:17, the son identified in this way receives a double portion and the stated legal right of the birthright; Exodus 13:2 applies the designation to humans and animals that open the womb, while Exodus 12:29 uses construct forms for the firstborn across Egyptian social settings and livestock. Exodus 4:22 applies the same family designation to Israel as God's son.

   1 Chronicles 3:1Genesis 43:33Deuteronomy 21:17Exodus 13:2Exodus 12:29Exodus 4:22

In the Anselm Project Bible: Across the supplied verses, the APB regularly presents the designation with “firstborn,” whether it marks a named son, people and animals, or Israel as God's son. Its wider wording about inheritance, redemption, or judgment describes the verse's setting rather than independently defining the term.