Sayyiduna Abu Dharr (may Allah be pleased with him) said: I heard the Messenger of Allah (peace and blessings be upon him) say: "On camels there is zakah, on sheep and goats there is also zakah, on cattle there is also zakah, and on cloth there is also zakah."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الزكاة / 7602