The Messenger of Allah ﷺ appointed him commander over a detachment. He said: I went out along with it. He (the Prophet) said: If you find so-and-so, burn him with the fire. I then turned away, and he called me. So I returned to him, and he said: If you find so-and-so, kill him, and do not burn him, for no one punishes with fire except the Lord of the fire.
أَنَّ رَسُولَ اللَّهِ ﷺ أَمَّرَهُ عَلَى سَرِيَّةٍ قَالَ فَخَرَجْتُ فِيهَا وَقَالَ إِنْ وَجَدْتُمْ فُلاَنًا فَاحْرِقُوهُ بِالنَّارِ فَوَلَّيْتُ فَنَادَانِي فَرَجَعْتُ إِلَيْهِ فَقَالَ إِنْ وَجَدْتُمْ فُلاَنًا فَاقْتُلُوهُ وَلاَ تُحْرِقُوهُ فَإِنَّهُ لاَ يُعَذِّبُ بِالنَّارِ إِلاَّ رَبُّ النَّارِ