Reference for Gittin 56:14

אלא לאו מת יוצא למות נהרג יוצא ליהרג וקתני בב"ד ישראל ישיאו את אשתו

but in the case of the sin-offering of the bird I should say that, as there is a doubt [whether the person who sent it is still alive], we should not [take the risk of] bringing profane things into the Temple court. Hence [all three clauses] are necessary.

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Jastrow

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