The Messenger of Allah ﷺ forbade cauterization, but we cauterized ourselves anyway, and we neither prospered nor succeeded.
حدثنا هشيم عن يونس عن الحسن
نهى رسول الله ﷺ عن الكي فاكتوينا فما أفلحنا ولا أنجحنا
Its isnad is sahih, and it has already appeared at 17917.