Reference for Sanhedrin 130:18

רב חנינא ורב אושעיא הוו יתבי כל מעלי שבתא ועסקי בספר יצירה ומיברו להו עיגלא תילתא ואכלי ליה

let thy father's grave, whence no smoke ascends on the Sabbath,<span class="x" onmousemove="('comment',' The whole week smoke ascended from his grave, as he was being burnt in the fires of purgatory: but even the wicked in Gehenna have rest from their torments on the Sabbath. ');">¹⁷</span>

Jastrow

Jastrow