1/ Tomorrow is the Day of Arafah. It is the Day that Allah chose to reveal one of the most blessed verses in the Quran, "Today, I have completed this religion for you, and perfected My favors upon you, and chosen Islam as you way of life" [Mā'idah; 3].
2/ It is a Day that Allah gives an oath by, and calls it a day that is 'witnessed', in the verse: وَشَاهِدٍ وَمَشْهُودٍ. Ibn Abbās said, "The shāhid is Friday, and the 'mashhūd' is the Day of Arafah." So Arafah is a Day that Allah and the angels are witnessing and observing.
3/ It is the Day of Ḥajj and the essence of the pilgrimage. The Prophet ﷺ said, "Ḥajj is Arafah," meaning it's all about that day.
4/ It is a day whose fasting expiates the minor sins of the year before and the year after - one single day's fast equivalent to two year's of forgiveness!! There is no other day like it in the whole year.
5/ It is said that this was the Day that Allah took the Covenant (mīthāq) from Adam and his children, and this was the Day that Allah accepted the repentance of Adam.
6/ It is a Day of Forgiveness and of being freed from Jahannam. We learn in the ḥadīth that on no single day are more people forgiven or saved from Jahannam than on this Day.
7/ It is a Day that Shayṭān himself feels the most humiliated and despised as he sees the Mercy of Allah descending down.
8/ It is a Day that Allah descends down to the lower Heavens, and boasts to the angels about the pilgrims, and grants them their every wish.
9/ Simply put: "The best day of the year is the Day of Arafah" [Ibn Ḥibbān]
So make sure that you take advantage of that Day, do lots of takbīr, du`ā, and say:
,لَا إِلَهَ إِلَّا اللَّهُ وَحْدَهُ لَا شَرِيكَ لَهُ لَهُ الْمُلْكُ وَلَهُ الْحَمْدُ وَهُوَ عَلَى كُلِّ شَيْءٍ قَدِيرٌ
So make sure that you take advantage of that Day, do lots of takbīr, du`ā, and say:
,لَا إِلَهَ إِلَّا اللَّهُ وَحْدَهُ لَا شَرِيكَ لَهُ لَهُ الْمُلْكُ وَلَهُ الْحَمْدُ وَهُوَ عَلَى كُلِّ شَيْءٍ قَدِيرٌ
