Reference for Ketubot 213:2

בששמעו בו שמת כולי עלמא לא פליגי כי פליגי בשלא שמעו בו שמת רב אמר פוסקין דהא משועבד לה ושמואל אמר אין פוסקין

In a case where they heard that he died they do not argue. They only differ when they did not hear that he had died. Rav said: They make an allowance for he is obligated to maintain her. Shmuel said: They do not make an allowance.

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