119. The Day of 'Arafah

خير الدعاء دعاء يوم عرفة ، وخيرُ ما قلت أنا والنبيُّون من قبلي : لا إله إلا الله وحدهُ لا شريك لهُ ، لهُ الملكُ ولهُ الحمدُ وهو على كل شيء قدير.

Lā 'ilāha 'illallāhu waḥdahu lā sharīka lahu, lahul-mulku wa lahul-ḥamdu wa huwa `alā kulli shay'in qadīr.

None has the right to be worshipped but Allah Alone, Who has no partner. His is the dominion and His is the praise, and He is Able to do all things.

Source: At-Tirmidhi. Al-Albani graded it good in Sahih At-Tirmidhi 3/184, and also Silsilatul-'Ahadith As-Sahihah 4/6.