Reference : Hisn al-Muslim 83

حَسْبِـيَ اللّهُ لا إلهَ إلاّ هُوَ عَلَـيهِ تَوَكَّـلتُ
وَهُوَ رَبُّ العَرْشِ العَظـيم.(سبع مرات)
Ḥasbiyallāhu lā ilāha illā huwa `alayhi tawakkalt,
wa huwa Rabbu ‘l-`Arshi ‘l-'Aẓīm.


Allah is sufficient for me. There is none worthy of worship but Him. 
I have placed my trust in Him, He is Lord of the Majestic Throne.
(Recite seven times in Arabic.)

Reference:
Allah will grant whoever recites this seven times in the morning or evening 
whatever he desires from this world or the next, Ibn As-Sunni (no. 71), Abu 
Dawud 4/321. Both reports are attributed directly to the Prophet j§ 
(Marfu1). The chain of transmission is sound (Sahih). Ibn As-Sunni.

Chapter: In the morning and evening