The best supplication offered on the Day of ‘arafaat is that of the Prophet Muhammad (Sallallaahu alaihi wa sallam)

Laa ilaaha illallaahu wahdahu laa shareeka lah, lahul-mulku walahul-hamdu wahuwa ‘ala kulli shay-in qadeer

(There is no true God worthy of being worshipped except Allaah, alone, without any partners, to Him belongs the Kingdom, and all-praise is due to Him, and He is able to do all things).

Source : Hajj and Tawheed by Dr. Saleh as-Saleh ( Pg 25)

The Messenger of Allaah (Sallallaahu ‘alayhi wasallam) said:

(( خَيرُ الدُّعَاءِ : دُعَاءُ يَومِ عَرَفَةَ ، وَ خَيرُ مَا قُلْتُ أَنَا وَ النَّبِيُّونَ مِنْ قَبْلِي :  لاَ إِلَهَ إِلاَّ اللهُ ، وَحْدَهُ لاَ شَرِيكَ لَهُ ، لَهُ المُلكُ ، وَ لَهُ الحَمدُ ، وَ هُوَ عَلَى كُلِّ شَيءٍ قَدِيرٌ ))

The best du’aa is the du’aa on the Day of ‘Arafah, and the best thing that I and the Prophets before me said is:

‘Laa ilaaha illallaah, wahdahu laa shareeka lah, lahul-Mulku wa lahul-hamd,  wa huwa ‘alaa kulli shayin qadeer’.”

(There is nothing that deserves to be worshipped in truth except Allaah, He is Alone and has no partner, to Him belongs the dominion and to Him belongs all praise, and He is All-Powerful over all things) [1]

[1]  At-Tirmidhee (#3585): Declared hasan by Shaykh al-Albaanee. SeeAs-Saheehah (#1503)

Posted by (Aboo Sufyaan Uthmaan Beecher)