Matthew Henry on Leviticus 12:1-5
The law here pronounces women lying-in ceremonially unclean. The Jews say, "The law extended even to an abortion, if the child was so formed as that the sex was distinguishable." 1. There was some time of strict separation immediately after the birth, which continued seven days for a son and fourteen for a daughter, Lev 12:2, Lev 12:5. During these days she was separated from her husband and friends, and those that necessarily attended her were ceremonially unclean, which was one reason why the males were not circumcised till the eighth day, because they participated in the mother's pollution during the days of her separation. 2. There was also a longer time appointed for their purifying; th…
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And the Lord spake unto Moses,.... The laws in the preceding chapter were delivered both to Moses and Aaron, but what follows in this only to Moses; but inasmuch as the priest had a concern in it, it being his business to offer the sacrifices required by the following law, it was no doubt given to Moses, to be delivered to Aaron, as well as to the people. R. Semlai remarks, that as the creation of man was after that of the beasts, fowls, fishes, &c. so the laws concerning the uncleanness of men are after those relating to beasts, &c, and they begin with the uncleanness of a new mother, because, as Aben Ezra observes, the birth is the beginning of man:
saying: as follows.
Keil & Delitzsch on Leviticus 12:1-2
Uncleanness and Purification after Child-Birth. - Lev 12:2-4. "If a woman bring forth (תּזריע) seed and bear a boy, she shall be unclean seven days as in the days of the uncleanness of her (monthly) sickness." נדּה, from נדד to flow, lit., that which is to flow, is applied more especially to the uncleanness of a woman's secretions (Lev 15:19). דּותהּ, inf. of דּוה, to be sickly or ill, is applied here and in Lev 15:33; Lev 20:18, to the suffering connected with an issue of blood.
Tyndale Open Study Notes on Leviticus 12:1-8
These verses detail the regulations pertaining to childbirth. Any bodily discharge, even blood, was considered “abnormal” because it reduced the vitality of the individual and rendered the person ceremonially unclean (see study notes on 5:3; 11:1–15:33). Accordingly, not childbirth but the discharge accompanying it is addressed in these verses (12:2, 5, 7). The uncleanness was not sinful in itself, but only if it was neglected and allowed to come into contact with what is holy (see 5:2-3).