"Jarir said: 'Some Bedouin people came to the Prephet and said: O Messenger of Allah, some of your Zakah collectors come to us and they are unfair. He said: Keep your Zakah collectors happy. They said: Even if they are unfair? He said: Keep your Zakah collectors happy. Then they said: Even if they are unfair. He said: Keep your Zakah collectors happy. Jarir said: No Zakah collector left me, since I heard this from the Messenger of Allah but he was pleased with me."
Sunan an-Nasa'i Book 23, Hadith 26