كتاب الزكاة
12  
The Book of Zakat
(22)
Chapter: The virute of giving gifts
(22)
باب فَضْلِ الْمَنِيحَةِ ‏‏
Sahih Muslim 1019

It is narrated on the authority of Abu Huraira (that the Messenger of Allah) said:

Of course the person who gives to the family a she-camel as a gift, which gives milk morning and evening equal to a large bowl, its reward (the reward of the gift) is great.
حَدَّثَنَا زُهَيْرُ بْنُ حَرْبٍ، حَدَّثَنَا سُفْيَانُ بْنُ عُيَيْنَةَ، عَنْ أَبِي الزِّنَادِ، عَنِ الأَعْرَجِ، عَنْ أَبِي هُرَيْرَةَ، يَبْلُغُ بِهِ ‏ "‏ أَلاَ رَجُلٌ يَمْنَحُ أَهْلَ بَيْتٍ نَاقَةً تَغْدُو بِعُسٍّ وَتَرُوحُ بِعُسٍّ إِنَّ أَجْرَهَا لَعَظِيمٌ ‏"‏ ‏.‏
Reference : Sahih Muslim 1019
In-book reference : Book 12, Hadith 94
USC-MSA web (English) reference : Book 5, Hadith 2225
  (deprecated numbering scheme)