An Arab once said to Rabbah bar Channah, "Come and I will show thee the
place where Korah and his accomplices were swallowed up." "There," says
the Rabbi, "I observed smoke coming out from two cracks in the ground.
Into one of these he inserted some wool tied on to the end of his spear,
and when he drew it out again it was scorched. Then he bade me listen. I
did so, and as I listened heard them groan out, 'Moses and his law are
true, but we are liars.' The Arab then told me that they come round to
this place once in every thirty days, being stirred about in the
hell-surge like meat in the boiling caldron."
THE TALMUD, _Bava Bathra_, fol. 74, col. 1.