Language:
كتاب المغازى
64  
Military Expeditions led by the Prophet (pbuh) (Al-Maghaazi)
(35)
Chapter: The Ghazwa of Al-Hudaibiya
(35)
باب غَزْوَةِ الْحُدَيْبِيَةِ
Sahih al-Bukhari 4166

Narrated `Abdullah bin Abi `Aufa:

(Who was one of those who had given the Pledge of allegiance to the Prophet (ﷺ) beneath the Tree) When the people brought Sadaqa (i.e. rak`at) to the Prophet (ﷺ) he used to say, "O Allah! Bless them with your Mercy." Once my father came with his Sadaqa to him whereupon he (i.e. the Prophet) said. "O Allah! Bless the family of Abu `Aufa."

حَدَّثَنَا آدَمُ بْنُ أَبِي إِيَاسٍ، حَدَّثَنَا شُعْبَةُ، عَنْ عَمْرِو بْنِ مُرَّةَ، قَالَ سَمِعْتُ عَبْدَ اللَّهِ بْنَ أَبِي أَوْفَى ـ وَكَانَ مِنْ أَصْحَابِ الشَّجَرَةِ ـ قَالَ كَانَ النَّبِيُّ صلى الله عليه وسلم إِذَا أَتَاهُ قَوْمٌ بِصَدَقَةٍ قَالَ ‏"‏ اللَّهُمَّ صَلِّ عَلَيْهِمْ ‏"‏‏.‏ فَأَتَاهُ أَبِي بِصَدَقَتِهِ فَقَالَ ‏"‏ اللَّهُمَّ صَلِّ عَلَى آلِ أَبِي أَوْفَى ‏"‏‏.‏
Reference : Sahih al-Bukhari 4166
In-book reference : Book 64, Hadith 208
USC-MSA web (English) reference : Vol. 5, Book 59, Hadith 484
  (deprecated numbering scheme)