Jami` at-Tirmidhi 2483
جامع الترمذي#2483SahihHarithah bin Mudarrib said:"We went to visit Khabbab who had himself cauterized in seven places on his body. He said: 'I have been ill for so long, and if it was not that I heard the Messenger of Allah (s.a.w) saying: "None of you should wish for death" then I would have wished for it, and he said: "A man is rewarded for [all of] his spending except for the dust" - or he said - "in the building
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Ahmad Muhammad ShakirSahih
Al-AlbaniSahih
Bashar Awad MaaroufHasan Sahih
Zubair Ali ZaiSahih
In-book reference: 37:69