Gen 38:8 | JFB | STEP | 8. 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 ).

Genesis 38:8

8. 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 De 25:5).