Yibbum

Yibbum, or levirate marriage, in Judaism, is one of the most complex types of marriages mandated by Torah law (Deuteronomy 25:5-10) by which, according to the law, the brother of a man who died without children has an obligation to marry the widow. However, if either of the parties refuses to go through with the marriage, both are required to go through a ceremony known as halizah, involving a symbolic act of renunciation of their right to perform this marriage. Jewish law (halakha) has seen a gradual decline of yibbum in favor of halizah, to the point where in most contemporary Jewish communities the former is strongly discouraged.