Sayyiduna Abu Umamah (may Allah be pleased with him) narrated: I and some people with me went in to Sayyiduna Khabbab bin al-Aratt (may Allah be pleased with him), and he had had himself cauterised on his side. We said: Have you had yourself cauterised? He said: Yes, I heard the Messenger of Allah (peace and blessings be upon him) say: "Seventy thousand of my Ummah will enter Paradise without reckoning: those who do not seek ruqyah (incantation), nor ask to be blown over, nor have themselves cauterised, and who put their trust in their Lord."
Hadith Referenceالمعجم الكبير للطبراني / باب الخاء / 3606
Sayyiduna Khabbab (may Allah be pleased with him) narrated: I heard the Messenger of Allah (peace and blessings be upon him) say: "Whatever the believer spends, he is rewarded for it, except for spending on this earth (building)."
Hadith Referenceالمعجم الكبير للطبراني / باب الخاء / 3607