Fast the Day of Arafah
صِيَامُ يَوْمِ عَرَفَةَ أَحْتَسِبُ عَلَى اللَّهِ أَنْ يُكَفِّرَ السَّنَةَ الَّتِي قَبْلَهُ وَالسَّنَةَ الَّتِي بَعْدَهُ
Siyamu yawmi 'Arafata ahtasibu 'ala-llahi an yukaffira-s-sanata-llati qablahu wa-s-sanata-llati ba'dah.
"Fasting the Day of Arafah, I hope from Allah that it expiates the year before it and the year after."
Narrated by Abu Qatadah. Sahih Muslim 1162
A short reflection
One day of the year, the 9th of Dhul-Hijjah. Two years' worth of slate, cleared for the price of daylight hunger.