´It was narrated from Mu'awiyah that the Messenger of Allah said:` "Do not be demanding when asking. If one of you asks me for anything and I give it reluctantly, there will be no blessing in it."
Hadith ReferenceSunan an-Nasa'i / The Book of Zakah / Hadith: 2594
Hadith Gradingالألبانی:صحيح | زبیر علی زئی:صحيح مسلم