English translation
1737. It was narrated from'Abdullāh bin 'Umar that the Dayof 'Āshurā' was mentioned in thepresence of the Messenger ofAllāh ﷺ. The Messenger of Allāhﷺ said: "That was a day whenthe people of the Ignorance used tofast. So whoever among youwants to fast may do so, andwhoever does not want to mayleave it." (Sahih)
