Reference for Berakhot 38:17

יכול כשם שאינו מטמא להם כך אינו מטמא למת מצוה ת"ל ולאחותו לאחותו הוא דאינו מטמא

It is possible [to think] that in the same way that [under these conditions] he may not make himself unclean for his relatives, he may not make himself unclean for a Met Miswah, therefore there is a teaching to tell us "or for his sister" ; i.e. "for his sister" he may not render himself unclean,

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