Sahih Bukhari
One-fifth of Booty to the Cause of Allah (Khumus)
Volume: 004 / Book Number: 053 / Hadith Number: 372
Narrated 'Amr bin Taghlib:
Allah's Apostle gave (gifts) to some people to the exclusion of some others. The latter seemed to be displeased by that. The Prophet said, "I give to some people, lest they should deviate from True Faith or lose patience, while I refer other people to the goodness and contentment which Allah has put in their hearts, and 'Amr bin Taghlib is amongst them." 'Amr bin Taghlib said, "The statement of Allah's Apostle is dearer to me than red camels."
Narrated Al-Hasan: 'Amr bin Taghlib told us that Allah's Apostle got some property or some war prisoners and he distributed them in the above way (i.e. giving to some people to the exclusion of others) .