Sahih Muslim
The Book of Zakat (Kitab Al-Zakat)
Book Number: 005 / Hadith Number: 2258
Mu'awiya reported AUah's Messenger (may prom be upon him) as saying: Do not beg importunately, for, I swear by Allah, none of you who asks me for anything and manages to get what he asks for when I disapprove td it will he be blessed in that which I give him.