"The Messenger of Allah sent me to Yemen and he commanded me to take one-tenth of whatever is irrigated by the sky, and half of one-tenth of whatever is irrigated by means of buckets."
Sunan an-Nasa'i Book 23, Hadith 56
← Previous Hadith "The Messenger of Allah said:'For that which is watered by the sky, rivers and springs, one-tenth. For whatever is irrigated by animals, one-half of one-tenth."'

Sunan an-Nasa'i Book 23, Hadith 55 Next Hadith → "Sahl bin Abi Hathmah came to us when we were in the market and said: "The Messenger of Allah said: When you have estimated, take two-thirds (of the portion you have estimated as Zakah) and leave one-third, and if you do not take (two-thirds) or leave one-third. (One of the reporters) Shu 'bah doubted - leave one quarter."

Sunan an-Nasa'i Book 23, Hadith 57