The Importance of the Day of Arafah
It is a recommended sunnah of the Prophet (pbuh) for those who are not pilgrims to fast on this day, since the Prophet (pbuh) was asked about fasting on the day of Arafah, so he said:
"It expiates the sins of the past year and the coming year." (Muslim)
The Prophet (pbuh) also said:
"There is no day on which Allaah frees people from the Fire more so than on the day of 'Arafah. He comes close to those (people standing on 'Arafah), and then He reveals before His Angels saying, ‘What are these people seeking." (Muslim)
Things to Do on the Day of Arafah
1. Fasting on the Day of Arafah:
Fasting is highly encouraged and recommended for those not going on hajj.
"Fasting on the Day of Arafah expiates the sins of the past year and the coming year." (Muslim)
2. DU'AA OF ARAFAH: Saying this du'aa very often:
The Prophet Muhammad, peace be upon him, said:
"The most excellent dua is the dua on the Day of Arafah, and the best of what I and the prophets before me have said, is "There is nothing that deserves to be worshiped in truth except Allaah, He is Alone and has no partner, to Him belongs the dominion and to Him belongs all praise, and He is All-Powerful over all things.'" (Muwatta)
لا إله إلا الله وحده لا شريك له ، له الملك ، وله الحمد ، وهو على كل شيء قدير
3. Making Tahleel, Takbeer, Tahmeed and Tasbeeh:
Its is a sunnah of our Prophet (pbuh) to recite the Tahleel, Takbeer and Tahmeed as many times as possible on the day of Arafah, and also on the days of Tashreeq (11, 12 and 13th of Dhul Hijjah)
Tahleel is to say "Laa ilaaha il-lal-laah"
Takbeer is to say "Allahu Akbar"
Tahmeed is to say "Alhamdulillaah"
Tasbeeh is to say "Subhanallaah".
4. Seek forgiveness from Almighty Allah:
The Prophet Muhammad (pbuh) said:
"On this day, Allah, the most Exalted, descends to the nearest heaven, and He is proud of His servants on the earth and says to those in heavens, look at My servants, they have come from far and near, with hair disheveled and faces covered with dust, to seek my Mercy. Even if their sins are as much the sand or the froth of the sea, I shall forgive them."