It was narrated from 'Abdur-Rahman bin Mas'ud bin Niyar:
"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."
Reference: Sunan an-Nasa'i 2491 In-book : Book 23, Hadith 57 English translation : Vol. 3, Book 23, Hadith 2493
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