Hazrat Muhammad bin Amr narrates from his father, who narrates from his grandfather, that during the time of Hazrat Umar, I suffered from pleurisy. So, a Bedouin was called to cauterize me. He refused to do so without the permission of Hazrat Umar. Upon this, my father went to Hazrat Umar and informed him of the incident. Hazrat Umar said: Do not go near fire, because this patient has an appointed time, which he can neither advance nor delay.