مُسْنَدُ أَحْمَدَ
Musnad Ahmad 3678
Musnad of Abdullah bin Mas'ood
It was narrated from 'AbduIlah (رضي الله عنه) that Some people came to the Prophet (ﷺ) and said: A friend of ours is sick; should we use cautery? And he kept quiet. Then they said: Should we use cautery? And he kept quiet. Then he said: "Cauterize him using hot stones.”
Musnad Ahmad 3701Its isnad is saheeh]