Hadith 3051 - Fighting for the Cause of Allah (Jihaad) - Sahih Al-Bukhari - صحيح البخاري - Collection of Actions, Sayings and Teachings of Prophet Muhammad (صلى الله عليه و سلم) - Kutub as-Sittah

56. Fighting for the Cause of Allah (Jihaad) - كتاب الجهاد والسير

173) Chapter: If an infidel warrior comes in an Islamic territory

Narrated Salama bin Al-Akwa`:

"An infidel spy came to the Prophet (ﷺ) while he was on a journey. The spy sat with the companions of the Prophet (ﷺ) and started talking and then went away. The Prophet (ﷺ) said (to his companions), 'Chase and kill him.' So, I killed him." The Prophet (ﷺ) then gave him the belongings of the killed spy (in addition to his share of the war booty).

Reference: 3051
English reference: Vol. 4, Book 52, Hadith 286
In-book reference: Book 56, Hadith 257
Grade: Sahih
Read this hadith from Darussalam Collection

173) باب الْحَرْبِيِّ إِذَا دَخَلَ دَارَ الإِسْلاَمِ بِغَيْرِ أَمَانٍ

حَدَّثَنَا أَبُو نُعَيْمٍ، حَدَّثَنَا أَبُو الْعُمَيْسِ، عَنْ إِيَاسِ بْنِ سَلَمَةَ بْنِ الأَكْوَعِ، عَنْ أَبِيهِ، قَالَ أَتَى النَّبِيَّ صلى الله عليه وسلم عَيْنٌ مِنَ الْمُشْرِكِينَ وَهْوَ فِي سَفَرٍ، فَجَلَسَ عِنْدَ أَصْحَابِهِ يَتَحَدَّثُ ثُمَّ انْفَتَلَ، فَقَالَ النَّبِيُّ صلى الله عليه وسلم ‏‏‏.‏ فَقَتَلَهُ فَنَفَّلَهُ سَلَبَهُ‏.‏ "‏ اطْلُبُوهُ وَاقْتُلُوهُ ‏"