Reference for Bekhorot 47:45

פטור מן הבכורה כמאן כרשב"ג ואסור באכילה כרבנן

and it is forbidden to be eaten Until he come and teach<span class="x" onmousemove="('comment',' The word is used here in the sense that Elijah will teach. The usual rendering of the word, however, is 'to cause to rain'.');">²⁷</span>

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