It is narrated from Sayyiduna Ali (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "I have exempted you from paying zakat on horses and slaves, therefore you must pay zakat on silver in any case. Its nisab is that for every forty, one dirham will be obligatory. Nothing will be obligatory up to one hundred and ninety dirhams, but when their amount reaches two hundred, then five dirhams will be obligatory on it."