Yahya related to me from Malik that Yahya ibn Said said, "I heardthat Sad ibn Zurara cauterized himself because of a pain in the throataccompanied by blood and he died." (RU)
USC-MSA web (English) reference: Book 50, Hadith 13 (RU)
Arabic reference (RU): Book 50, Hadith 1726 (RU)