The hadith of Asim bin Damrah and al-Harith, from Sayyiduna Ali (may Allah be pleased with him), from the Prophet (peace and blessings be upon him) has already passed: "There is no zakah on any wealth until a year has passed over it."
And the hadith of Abdullah bin Mu'awiyah al-Ghadiri from the Prophet (peace and blessings be upon him) has also passed: "There are three things which, whoever does them, has tasted the taste of faith." Then he (peace and blessings be upon him) mentioned those deeds (one of them being:) "and he pays the zakah of his wealth every year with a willing heart, (a zakah) that brings him benefit."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الزكاة / Q7353