The first-born, especially the eldest son, held a privileged position in the family. He ordinarily received a double portion of the father’s inheritance and was regarded under the law as devoted to God. Male first-born animals were likewise devoted to God.
The eldest son was redeemed by an offering of no more than five shekels within one month of birth. Under the monarchy he usually succeeded his father, though this was not always so. Unclean animals were redeemed, sold, or put to death according to the law.
The first-born regulations recalled the death of Egypt’s first-born at the Exodus. The prescribed redemption of a son was five shekels.