مِشْكَاةُ الْمَصَابِيحِ
Mishkat al-Masabih 3961
Jihad
The Ordinance about Prisoners - Section 1
وَعَنْ سَلَمَةَ بْنِ الْأَكْوَعِ قَالَ أَتَى النَّبِيُّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ عَيْنٌ مِنَ الْمُشْرِكِينَ وَهُوَ فِي سَفَرٍ فَجَلَسَ عِنْدَ أَصْحَابِهِ يَتَحَدَّثُ ثُمَّ انْفَتَلَ فَقَالَ النَّبِيُّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «اطْلُبُوهُ وَاقْتُلُوهُ» . فَقَتَلْتُهُ فنفَّلَني سلبَه
Salama b. al-Akwa‘ said: A spy of the polytheists who came to the Prophet (ﷺ) when he was on a journey sat and talked with his companions and afterwards withdrew. The Prophet (ﷺ) then said, “Look for him and kill him,” so I killed him and the Prophet (ﷺ) gave me the spoil taken from him. (Bukhari and Muslim.)
Mishkat al-Masabih, 3961مُتَّفَقٌ عَلَيْهِ (الألباني)