The Day of Arafah1 du'a

None has the right to be worshipped but Allah Alone, Who has no partner. His is the dominion and His...

Reference:At-Tirmidhi. Al-Albani graded it good in Sahih At-Tirmidhi 3/184, and also Silsilatul-'Ahadith As-Sahihah 4/6.Hisnul Muslim 237

لا إله إلا الله وحدهُ لا شريك لهُ لهُ الملكُ ولهُ الحمدُ وهو على كل شيء قدير.

Transliteration

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

Translation

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.