See Bereshith Rabba, fol. 4, with reference to what is here said about Turnus Rufus and his father's grave. The proof from the necromancer lies in the allegation that his art was unsuccessful if practiced on the Sabbath-day. The Sambatyon, Rashi says, is a pebbly river which rushes along all the days of the week except the Sabbath, on which it is perfectly still and quiet. In the Machsor for Pentecost (D. Levi's ed. p. 81), it is styled "the incomprehensible river, and a footnote thereto informs us that "This refers to the river said to rest on the Sabbath from throwing up stones, etc., which it does not cease to do all the rest of the week.* (See Sanhedrin, fol. 65, col. 2; Yalkut on Isaiah, fol. 3, 1; Pesikta Tanchuma. See also Shalsheleth Hakabbala and Yuchsin.)