Audio by Dr. Michael Sokolow

A boy of the age of nine years and one day renders [his sister-in-law] unfit [for marriage] with his brothers, and his brothers render her unfit for him, but while he renders her unfit from the outset only, the brothers render her unfit both from the outset and at the end. In what manner? A boy of the age of nine years and one day who cohabited with his sister-in-law renders her unfit [for marriage] with his brothers; the brothers, however, render her unfit for him whether they cohabited with her, addressed to her a Maamar, gave her a letter of divorce or submitted to her halizah.  יבמות 10.6 
בן תשע שנים ויום אחד-- הוא פוסל על ידי אחים, והאחים פוסלין על ידו; אלא שהוא פוסל תחילה, והאחים תחילה וסוף׃ כיצד׃ בן תשע שנים ויום אחד שבא על יבמתו, פסל על ידי אחים; באו עליה אחים, ועשו בה מאמר, ונתנו גט או חלצו-- פסלו על ידו
If a boy of the age of nine years and one day cohabited with his sister-in-law and then his brother who was of the age of nine years and one day cohabited with her, [the latter] renders her unfit for [the former]. R. Simeon said: He does not render her unfit. יבמות 10.7
בן תשע שנים ויום אחד שבא על יבמתו, ואחר כך בא אחיו שהוא בן תשע שנים ויום אחד עליה-- פסל על ידו; רבי שמעון אומר, לא פסל

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