1) Fasting on this day will forgive for the sins of two years. You will also be credited with keeping the fast in the year before this one, and in the year to come after it . Fasting the day of `Arafah-9th Dhul-Hijjah Forgives ONLY all Minor sins of two years: a past one and a coming one.
2) Hadith "The best supplication is the one on the day of Arafah -9th of Dhul-Hijjah Day of ‘Arafa , and the best thing which I and the prophets before me have said is, ‘There is no god but Allah alone who has no partner; to Him belongs the dominion, to Him praise is due, and He is Omnipotent (able to do all things)
( La ilaaha illallah wahdahu la sharikalah, lahulmulk, wa lahulhamd, wa huwa ala kulli shay in qadir)
3) Increase your acts of worship, your remembrance, and your supplication throughout this great day. This is a day in which salvation from the hellfire is within your reach. The Prophet (saw) said, "There is no day in which Allah liberates more servants from the hellfire than the Day of Arafah-9th of Dhul-Hijjah"