Fasting on the day of Arafah:Abu Hafsah, may Allah be pleased with him, reported that the Prophet, upon whom be peace, said:"Fasting on the Day of 'Arafah absolves the sins for two years: the previous year and the coming year, and fasting on 'Ashura, (the tenth day of Muharram) atones for the sins of previous years."[Reported by all except Al-Bukhari and At-Tirmidhi]In another saying the Prophet's wife Hafsah, may Allah be pleased with her, said:"Four things the Messenger of Allâh never neglected: Observing fast on the day of 'Ashura, 'Arafat, three days every month, and offering fajr sunnah prayers early in the morning."[Muslim]Ibn ʿUmar (Rady'Allahu anhu) narrates that the Prophet صلى الله عليه وسلم said: “When the evening of ʿArafa arrives, nobody with a mustard seed’s weight of faith in their heart is left, but they are forgiven.” The Prophet’s companions asked, “O Messenger of Allah (sallallahu alaihe wa sallam), is this restricted only to people on ʿArafah?” He (sallallahu alaihe wa sallam) said,“No, it is for all Muslims.” [Al-Tabarāni]