Hazrat Abu Darda ( R.A ) narrates that Rasoolullah ( S.A.W ) mentioned:
"Whosoever recites 7 times morning and evening the following Dua, Allah Ta'ala will suffice for him by removing his grief of this world and the hereafter"
Hasbiyallahu lailaha illahuwa alaihi tawakkaltu wahuwa Rabbul arshil azeem.
"Allah suffice me. There is none worthy of worship but He alone. On Him is my trust, He is the Lord of the Supreme Throne."
و هو ربَ العرش العظيم.
wa Huwa Rab-bal 'arshil 'atheem
(Whoever says this 7 times in the morning after fajr,
and 7 times after Asr, Allah will take care of whatever worries him
/her of the matter of this world and the hereafter)
[Reported by Sahih Muslim]