سنن أبي داود

Bahz b Hakim reported from his grandfather: The Messenger of Allah (ﷺ) said: For forty pasturing camels, one she-camel in her third year is to be given. The camels are not to be separated from reckoning. He who pays zakat with the intention of getting reward will be rewarded. If anyone evades zakat, we shall take half the property from him as a due from the dues of our Lord, the Exalted. There is no share in it (zakat) of the descendants of Muhammad (ﷺ).