Lev 18:18 | KD | STEP | Lastly, it was forbidden to take a wife to her sister (עליה upon her, as in ; ) in her life-time, that is to say, to marry two sisters at the same time, לצרר “to pack together, to uncover this nakedness,” i.e., to pack both together into one marriage bond, and so place the sisters in carnal union through their common husband, and disturb the sisterly relation, as the marriage with two sisters that was forced upon Jacob had evidently done. No punishment is fixed for the marriage with two sisters; and, of course, after the death of the first wife a man was at liberty to marry her sister. Prohibition of other kinds of unchastity and of unnatural crimes . - prohibits intercourse with a woman during her uncleanness. טמאה נדּת signifies the uncleanness of a woman’s hemorrhage, whether menstruation or after childbirth, which is called in ; , the fountain of bleeding. The guilty persons were both of them to be cut off from their nation according to , i.e., to be punished with death.

‏ Leviticus 18:18

Lastly, it was forbidden to take a wife to her sister (עליה upon her, as in Gen 28:9; Gen 31:50) in her life-time, that is to say, to marry two sisters at the same time, לצרר “to pack together, to uncover this nakedness,” i.e., to pack both together into one marriage bond, and so place the sisters in carnal union through their common husband, and disturb the sisterly relation, as the marriage with two sisters that was forced upon Jacob had evidently done. No punishment is fixed for the marriage with two sisters; and, of course, after the death of the first wife a man was at liberty to marry her sister.Prohibition of other kinds of unchastity and of unnatural crimes. - Lev 18:19 prohibits intercourse with a woman during her uncleanness. טמאה נדּת signifies the uncleanness of a woman’s hemorrhage, whether menstruation or after childbirth, which is called in Lev 12:7; Lev 20:18, the fountain of bleeding. The guilty persons were both of them to be cut off from their nation according to Lev 20:18, i.e., to be punished with death.