Reference for Moed Katan 33:12

מ"ט דעבד כר' אילעאי דתניא ר' אילעאי אומר אם רואה אדם שיצרו מתגבר עליו ילך למקום שאין מכירין אותו וילבש שחורים ויתעטף שחורים ויעשה מה שלבו חפץ ואל יחלל שם שמים בפרהסיא

A wasp then came and stung him in the privy member and he died. They brought him into 'The Grotto of the Pious', but they admitted him not.<span class="x" onmousemove="('comment',' It is forbidden to bury a bad man next to a good man. V. Sanh. 47a.');">¹⁰</span> They brought him into 'The Grotto of the Judges' and they received him.<span class="x" onmousemove="('comment',' He was such himself and had repented.');">¹¹</span>

Jastrow