Supplication on the Day of Arafah

قَالَ النَّبِيُّ صلى الله عليه وسلم: ((خَيْرُ الدُّعَاءِ دُعَاءُ يَوْمِ عَرَفَةَ، وَخَيْرُ مَا قُلْتُ أَنَا وَالنَّبيُّونَ مِنْ قَبْلِي: لاَ إِلَهَ إِلاَّ اللَّهُ وَحْدَهُ لاَ شَرِيكَ لَهُ، لَهُ الْمُلْكُ وَلَهُ الْحَمْدُ وَهُوَ عَلَى كُلِّ شَيْءٍ قَدِيرٌ)).

The Prophet (peace and blessings of Allah be upon him) said: "The best supplication is the supplication of the Day of Arafah, and the best that I and the prophets before me have said is: None has the right to be worshipped except Allah, alone, without partner. His is the dominion and His is the praise, and He is over all things omnipotent."