Reference for Moed Katan 23:17

אמר רב חמא בר גוריא אמר רב הלכות מועד כהלכות כותים בהלכה למאי הלכתא אמר רב דניאל בר קטינא (אמר רב) לומר שהן עקורות ואין למידות זו מזו

<big><b>MISHNAH: </b></big>LIKEWISE IF ONE HAD HIS WINE [ALREADY] RUN INTO THE CISTERN THEN MOURNING BEFELL HIM, OR [SOME OTHER] HINDRANCE, OR WORKMEN DISAPPOINTED HIM, HE MAY DRAW OFF [THE WINE], COMPLETE THE PROCESS AND BUNG [THE CASKS] IN HIS USUAL WAY: THESE ARE THE WORDS OF R'JOSE; R'JUDAH SAYS, HE [MERELY] COVERS [THE CISTERN] WITH SHINGLES TO PREVENT IT TURNING SOUR'<big><b>GEMARA:</b></big> [LIKEWISE IF ONE HAD etc.] And this [wine clause] is necessary.

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