Hakeem bin Hizam reported,

I asked the Prophet ﷺ and he gave to me. Then I asked him again and he gave to me. Then I asked him a third time and he gave to me. Then he said, "This wealth is green and sweet. Whoever takes it with a contented heart will be blessed in it, but whoever takes it with a greedy soul will not be blessed in it, and he will be like one who eats but is never satisfied. The upper hand is better than the lower hand."

Muslim 2387

Sahih

حدثنا أبو بكر بن أبي شيبة وعمرو الناقد قالا حدثنا سفيان عن الزهري عن عروة بن الزبير وسعيد

عن حكيم بن حزام قال

سألت النبي ﷺ فأعطاني ثم سألته فأعطاني ثم سألته فأعطاني ثم قال إن هذا المال خضرة حلوة فمن أخذه بطيب نفس بورك له فيه ومن أخذه بإشراف نفس لم يبارك له فيه وكان كالذي يأكل ولا يشبع واليد العليا خير من اليد السفلى

مسلم 2387صحيح
Contents
Reference
Commentary
Ayat
Collection
Sahih Muslim
Book
Zakat
Chapter
Clarification that the upper hand is better than the lower hand, and that the upper hand is the giving one and the lower one is the taking one
Numbering
Darussalam 2387
Muslim 2387