Deuteronomy 25:5
5 "When brothers live together and one of them dies and has no son , the wife of the deceased shall not be married outside the family to a strange man . Her husband's brother shall go in to her and take her to himself as wife and perform the duty of a husband's brother to her.
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Matthew Henry's Commentary on Deuteronomy 25:5
Commentary on Deuteronomy 25:5-12
(Read Deuteronomy 25:5-12)
The custom here regulated seems to have been in the Jewish law in order to keep inheritances distinct; now it is unlawful.