Sayyiduna Abu Hurayrah (may Allah be pleased with him) said that the Messenger of Allah (peace and blessings be upon him) said: "When the collector comes to you, give him your zakah. If they wrong you, turn away from them and do not curse them, and say: O Allah! I seek reward from You for what they have taken from me."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الزكاة / 7382