Lev 18:16 | TNotes | STEP | 18:16 Sexual relations with your sister-in-law would be adulterous and disgrace your brother. The exception was the law of levirate marriage (see Deut 25:5-10 ), which called for a man to marry his brother’s widow in order to produce an heir who was considered the dead brother’s son.

bDeut 25:5-10►

‏ Leviticus 18:16

18:16 ^a Sexual relations with your sister-in-law would be adulterous and disgrace your brother. The exception was the law of levirate marriage (see Deut 25:5-10 ^b), which called for a man to marry his brother’s widow in order to produce an heir who was considered the dead brother’s son.