Language:
كتاب فرض الخمس
57  
One-fifth of Booty to the Cause of Allah (Khumus)
(8)
Chapter: The statement of the Prophet saws: "Booty has been made legal for you Muslims."
(8)
بَابُ قَوْلِ النَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «أُحِلَّتْ لَكُمُ الْغَنَائِمُ»
Sahih al-Bukhari 3123

Narrated Abu Huraira:

Allah's Messenger (ﷺ) said, "Allah guarantees him who strives in His Cause and whose motivation for going out is nothing but Jihad in His Cause and belief in His Word, that He will admit him into Paradise (if martyred) or bring him back to his dwelling place, whence he has come out, with what he gains of reward and booty."

حَدَّثَنَا إِسْمَاعِيلُ، قَالَ حَدَّثَنِي مَالِكٌ، عَنْ أَبِي الزِّنَادِ، عَنِ الأَعْرَجِ، عَنْ أَبِي هُرَيْرَةَ ـ رضى الله عنه ـ أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ ‏ "‏ تَكَفَّلَ اللَّهُ لِمَنْ جَاهَدَ فِي سَبِيلِهِ، لاَ يُخْرِجُهُ إِلاَّ الْجِهَادُ فِي سَبِيلِهِ وَتَصْدِيقُ كَلِمَاتِهِ، بِأَنْ يُدْخِلَهُ الْجَنَّةَ، أَوْ يَرْجِعَهُ إِلَى مَسْكَنِهِ الَّذِي خَرَجَ مِنْهُ ‏{‏مَعَ مَا نَالَ‏}‏ مِنْ أَجْرٍ أَوْ غَنِيمَةٍ ‏"‏‏.‏
Reference : Sahih al-Bukhari 3123
In-book reference : Book 57, Hadith 32
USC-MSA web (English) reference : Vol. 4, Book 53, Hadith 352
  (deprecated numbering scheme)