Musannaf Ibn Abi Shayba 33:1114

Abu Usama narrated to us, he said: Nafi‘ ibn ‘Umar narrated to me, from Bishr ibn ‘Asim, he said: Tawus said: I have not seen anyone who felt secure regarding himself. I once saw a man, and if it were said to me, "Who is the best person you know?" I would have said, "Such-and-such," referring to that man. He remained in that state, then a pain seized his stomach, and something afflicted him from it. His stomach became distended upon him, and he desired it [the food/drink]. I saw him in pieces—I do not know which of his two sides was faster [to decay/break]—until he died sweating.