Reference for Bava Batra 201:4
ופותח לתוכה שתי מערות אחת מכאן ואחת מכאן רבי שמעון אומר ארבע לארבע רוחותיה
OUTSIDE THE ENTRANCE TO THE GROTTO IS TO BE MADE A COURT OF SIX [CUBITS] BY SIX, [WHICH IS] THE SPACE THE BIER AND THOSE WHO BURY IT OCCUPY. TWO GROTTOS<span class="x" onmousemove="('comment',' The one mentioned, and another facing it. ');"><sup>4</sup></span>
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