Al-Matalib al-'Aliyah 2508 — Cauterisation

Amr bin Murrah narrates from a shaykh, who narrates from an elder of his (whom he had not met), who said: I went with Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him) to visit Sayyiduna Khabbab (may Allah be pleased with him) in his illness, and he had had himself cauterised (with fire because of his illness). So Sayyiduna Ibn Mas'ud (may Allah be pleased with him) said: "O Abu Abdullah! Do you not know that we have been forbidden from this (cauterisation) and that it has been declared disliked for us?" At this Sayyiduna Khabbab (may Allah be pleased with him) replied: "The trial and pain had grown very severe, and the physicians said that there was now no other remedy left for you except this." So Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him) said (because of his abstinence and piety): "I did not fear that someone as eminent as you would do this."
Imam Abu Dawud al-Tayalisi recorded this hadith in his Musnad (no. 1049). Because two narrators in its chain are unnamed, it is da'if (weak).