Sahih al-Bukhari 3032
Sahih al-Bukhari · Book 56: Fighting for the Cause of Allah (Jihaad) · Killing non-Muslim warriors secretly
Narrated Jabir:
حَدَّثَنِي عَبْدُ اللَّهِ بْنُ مُحَمَّدٍ ، حَدَّثَنَا سُفْيَانُ ، عَنْ عَمْرٍو ، عَنْ جَابِرٍ ، عَنِ النَّبِيِّ صلى الله عليه وسلم قَالَ " مَنْ لِكَعْبِ بْنِ الأَشْرَفِ ". فَقَالَ مُحَمَّدُ بْنُ مَسْلَمَةَ أَتُحِبُّ أَنْ أَقْتُلَهُ قَالَ " نَعَمْ ". قَالَ فَأْذَنْ لِي فَأَقُولَ. قَالَ " قَدْ فَعَلْتُ " .
The Prophet (ﷺ) said, "Who is ready to kill Ka`b bin Ashraf (i.e. a Jew)." Muhammad bin Maslama replied, "Do you like me to kill him?" The Prophet (ﷺ) replied in the affirmative. Muhammad bin Maslama said, "Then allow me to say what I like." The Prophet (ﷺ) replied, "I do (i.e. allow you).