Sunan At-Tirmidhi

Harithah 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