Commentaries:
Jamieson, Fausset, and Brown
Judah said unto Onan . . . marry her, and raise up seed to thy brother—The first instance of a custom, which was afterwards incorporated among the laws of Moses, that when a husband died leaving a widow, his brother next of age was to marry her, and the issue, if any, was to be served heir to the deceased (compare Deuteronomy 25:5).
Other Jamieson, Fausset, and Brown entries containing Genesis 38:8:
Deuteronomy 25:5-10
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