Sunan Abu Dawud
2974
Sahih+3

Narrated Abu Hurairah: The Prophet (ﷺ) as saying: Do not distribute dinars among my heirs: Whatever I left after contribution to my wives and provisions for my governor is sadaqah (alms). Abu Dawud said: 'Amil means the workers or laborers on the land (i.e. peasants)

SahihAl-Albani
SahihMuhammad Muhyi Al-Din Abdul Hamid