Sayyiduna Jarir bin Abdullah (may Allah be pleased with him) said: Some Bedouins came to the Messenger of Allah (peace and blessings be upon him) and said: Your collectors come to us and treat us unjustly. The Messenger of Allah (peace and blessings be upon him) said: "Keep them pleased." He (peace and blessings be upon him) said this three times. Sayyiduna Jarir (may Allah be pleased with him) said: After that, whenever a collector came to me, he left only pleased.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الزكاة / 7378