Audio by Dr. Michael Sokolow

If a levir participated in halizah with his deceased brother`s wife who was subsequently found to be pregnant, and she gave birth, he is, wherever the child is viable, permitted to marry her relatives and she is permitted to marry his relatives, and he does not render her unfit for the priesthood; but wherever the child is not viable, the levir is forbidden to marry her relatives and she is forbidden to marry his relatives, and he renders her unfit to marry a priest.  יבמות 4.1
החולץ ליבמתו, ונמצאת מעוברת וילדה-- בזמן שהוולד של קיימה-- הוא מותר בקרובותיה, והיא מותרת בקרוביו, ולא נפסלה מן הכהונה׃ ואם אין הוולד של קיימה-- הוא אסור בקרובותיה, והיא אסורה בקרוביו, ונפסלה מן הכהונה
If a levir married his deceased brother`s wife who is found to have been pregnant, and she gave birth, He, wherever the child is viable, must divorce her. And both are under the obligation of bringing an offering; but if the child is not viable, he may retain her. If it is doubtful whether it is a nine-months child of the first [husband] or a seven-months child of the second [husband] she must be divorced, and the child is legitimate, but they are under the obligation of an asham talui.  יבמות 4.2
הכונס את יבמתו, ונמצאת מעוברת וילדה-- בזמן שהוולד של קיימה-- יוציא, וחייבין בקרבן; ואם אין הוולד של קיימה, יקיים׃ ספק בן תשעה לראשון, ובן שבעה לאחרון-- יוציא, והוולד כשר, וחייבין באשם תלוי

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