Sayyiduna Ali bin Abi Talib (may Allah be pleased with him) said that the Messenger of Allah (peace and blessings be upon him) said: "Bring me a quarter of the tenth." Then he narrated the whole hadith, and at its end he narrated: "There is no zakah on wealth until a year has passed over it."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الزكاة / 7273