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Smith's Bible Dictionary
First-born. Under the law, in memory of the Exodus (when the first-born of the Egyptians were slain), the eldest son was regarded as devoted to God, and was, in every case, to be redeemed by an offering not exceeding five shekels, within one month from birth. If he died before the expiration of thirty days, the Jewish doctors held the father excused, but liable to the payment if he outlived that time. Exodus 13:12-16; Leviticus 27:6.
The eldest son received a double portion of the father's inheritance, Deuteronomy 21:17, but not of the mother's. Under the monarchy, the eldest son usually, but no always, as appears in the case of Solomon, succeeded his father in the kingdom. 1 Kings 1:30; 1 Kings 2:22.
The male first-born of animals was also devoted to God. Exodus 13:2; Exodus 13:12-13; Exodus 22:29; Exodus 34:19-20. Unclean animals were to be redeemed with the addition of one-fifth of the value, or else put to death; or, if not redeemed, to be sold, and the price given to the priests. Leviticus 27:13; Leviticus 27:27-28.
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Smith, William, Dr. Entry for 'Firstborn'. Smith's Bible Dictionary. https://www.studylight.org/dictionaries/eng/sbd/f/firstborn.html. 1901.
the Week of Proper 24 / Ordinary 29