Reference for Bekhorot 43:43

יתיב רב דימי וקאמר להא שמעתא אמר ליה אביי

Said R'Jeremiah: This has been laid down only with regard to dipping bread in it but, for cooking purposes, the brine is not permitted,<span class="x" onmousemove="('comment',' For the water in the brine combines with the water in the pot and the two together being now the larger portion, neutralize the brine, and make the latter unclean.');">²⁴</span>

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