The Prophet Muhammad has urged people to fast this day. Abu Qataadah narrated that the Prophet Muhammad was asked about observing the fast on the day of ‘Arafah, he replied: “’Arafah’s fasting removes the sins of two years: the last and thecoming year.”(Muslim)- NOTE: MAJOR SINS REQUIRES TAWBAH
“He who washes a dead Muslim and conceals what he sees(1) Allah grants him forgiveness forty times(2) and he who digs for him a grave and buries him would be granted a reward similar to providing for him a dwelling until the Day of Resurrection. And he who shrouds him, Allah will clothe him on the Day of Resurrection from the silk garments of jannah.” (Authentic Hadith-صحيح الترغيب)
(1): Physical defects or other. (2):No one know how much reward there is in every time.