What did Allah's Apostle (saw) tell a man from the tribe of Al-Aslam to proclaim among his people on the day of 'Ashura' (peace be upon him)?
 Narrated Salama bin Al-Akwa`:                     Allah's Apostle said to a man from the tribe of Al-Aslam, "Proclaim among your people (or the people) on the day of 'Ashura' (tenth of Muharram), 'Whosoever has eaten anything should fast for the rest of the day; and whoever has not eaten anything, should complete his fast.' "