The Prophet (saw) said, 'The best supplication is the supplication of the day of 'Arafah. And the best of what I and the prophets before me have said is, "La ilaha ill-Allah, wahdaHu la sharika laHu, laHul-mulku wa laHul-hamdu, wa Huwa ‘ala kulli shai’in Qadir"'. [Tirmidhi]
It is Sunnah to recite the above du'a on the day of 'Arafah. It means: 'There is no god but Allah, Alone, without partner, to Him belongs the kingdom, and to Him belongs all praise, and He is Powerful over all things'.
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