Jami At Tirmidhi
2049
Sahih+3

Imran bin Husain narrated that the Messenger of Allah (s.a.w) prohibited cauterization. He said:"We were tested (with severe medical condition) so we were cauterized, but we did not have good results, nor was it successful for us." Another chain reports a similar narration

SahihAhmad Muhammad Shakir
SahihAl-Albani