Language:
كتاب الهبة وفضلها والتحريض عليها
51  
Gifts
(10)
Chapter: To give as a gift, something not present
(10)
باب مَنْ رَأَى الْهِبَةَ الْغَائِبَةَ جَائِزَةً
Sahih al-Bukhari 2583, 2584

Narrated Al-Miswar bin Makhrama and Marwan:

When the delegates of the tribe of Hawazin came to the Prophet (ﷺ) he stood up amongst the people, Glorified and Praised Allah as He deserved, and said, "Then after: Your brethren have come to you with repentance and I see it logical to return to them their captives; so whoever amongst you likes to do that as a favor, then he can do it, and whoever of you like to stick to his share till we give him his right from the very first Fai (war booty) (1) which Allah will bestow on us, then (he can do so)." The people replied, "We do that (to return the captives) willingly as a favor for your sake."

حَدَّثَنَا سَعِيدُ بْنُ أَبِي مَرْيَمَ، حَدَّثَنَا اللَّيْثُ، قَالَ حَدَّثَنِي عُقَيْلٌ، عَنِ ابْنِ شِهَابٍ، قَالَ ذَكَرَ عُرْوَةُ أَنَّ الْمِسْوَرَ بْنَ مَخْرَمَةَ، رضى الله عنهما وَمَرْوَانَ أَخْبَرَاهُ أَنَّ النَّبِيَّ صلى الله عليه وسلم حِينَ جَاءَهُ وَفْدُ هَوَازِنَ قَامَ فِي النَّاسِ، فَأَثْنَى عَلَى اللَّهِ بِمَا هُوَ أَهْلُهُ، ثُمَّ قَالَ ‏ "‏ أَمَّا بَعْدُ، فَإِنَّ إِخْوَانَكُمْ جَاءُونَا تَائِبِينَ، وَإِنِّي رَأَيْتُ أَنْ أَرُدَّ إِلَيْهِمْ سَبْيَهُمْ، فَمَنْ أَحَبَّ مِنْكُمْ أَنْ يُطَيِّبَ ذَلِكَ فَلْيَفْعَلْ، وَمَنْ أَحَبَّ أَنْ يَكُونَ عَلَى حَظِّهِ حَتَّى نُعْطِيَهُ إِيَّاهُ مِنْ أَوَّلِ مَا يُفِيءُ اللَّهُ عَلَيْنَا ‏"‏‏.‏ فَقَالَ النَّاسُ طَيَّبْنَا لَكَ‏.‏
Reference : Sahih al-Bukhari 2583, 2584
In-book reference : Book 51, Hadith 18
USC-MSA web (English) reference : Vol. 3, Book 47, Hadith 757
  (deprecated numbering scheme)