is considered one of the most intricate in Jewish law, partly because of the complication that arise from multiple brothers and multiple wives. Yibbum is an exception to the biblical prohibition for a man to have sexual relations with "his brother's wife" found for example in and . (See Incest in the Bible.)

When yibbum applies

The obligation for yibbum is found at , which requires that when a married man dies without having any children, male or female, from any relationship (including

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