Language:
كتاب الهبة وفضلها والتحريض عليها
51
Gifts
(16)
Chapter: Who is to be given the gift first?
(16)
باب بِمَنْ يُبْدَأُ بِالْهَدِيَّةِ
Sahih al-Bukhari 2594
Narrated Maimuna, the wife of the Prophet (ﷺ) that she manumitted her slave-girl and the Prophet (ﷺ) said to her, "You would have got more reward if you had given the slave-girl to one of your maternal uncles."
وَقَالَ بَكْرٌ عَنْ عَمْرٍو، عَنْ بُكَيْرٍ، عَنْ كُرَيْبٍ، مَوْلَى ابْنِ عَبَّاسٍ إِنَّ مَيْمُونَةَ زَوْجَ النَّبِيِّ صلى الله عليه وسلم أَعْتَقَتْ وَلِيدَةً لَهَا فَقَالَ لَهَا ‏ "‏ وَلَوْ وَصَلْتِ بَعْضَ أَخْوَالِكِ كَانَ أَعْظَمَ لأَجْرِكِ ‏"‏‏.‏
Reference : Sahih al-Bukhari 2594
In-book reference : Book 51, Hadith 28
USC-MSA web (English) reference : Vol. 1, Book 47, Hadith 767
  (deprecated numbering scheme)