Yebamoth: (יבמות, “Levirate marriage”); (or Yebamot or Yevamot), referring to the mandated marriage of a widow to her brother-in-law, deals with the Jewish law of levirate marriage (Deut. 25:5-10) and other topics, such as the status of minors. It consists of 16 chapters.

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http://kodesh.snunit.k12.il/b/h/h31.htm