that from every twenty Dinar or more. The Prophet used to take half a Dinar and from forty Dinar, one Dinar.
Sunan Ibn Majah Book 8, Hadith 9
← Previous Hadith the Messenger of Allah said: “I have exempted you from having to pay Zakat on horses and slaves, bring one quarter of one-tenth of every forty Dirhan: one Dirham.”

Sunan Ibn Majah Book 8, Hadith 8 Next Hadith → Aishah said: “I heard the Messenger of Allah(ﷺ) say: 'There is not Zakat on wealth until Hawl (one year) has passed.' ”

Sunan Ibn Majah Book 8, Hadith 10