The Book of Zakat (Kitab Al-Zakat)
Muslim :: Book 5 : Hadith 2255
Hakim b. Hizam reported: I begged the Apostle of Allah (may peace be upon him), and he gave me. I again begged, he again gave me. I again begged, he again gave me, and then said: This property is green and sweet; he who receives it with a cheerful heart is blessed in it, and he who receives it with an avaricious mind would not be blessed in it, he being like one who eats without being satished, and the upper hand is better thad the lower hand.