Whoever enters a market says: Laa ilaaha illAllah wahdahu laa sjareeka lah, lahul mulku wa lahul hamdu yuhyi wa yumeetu wa huwa hayyu laa yamoot, bi yadihil khayr, wahuwa alaa kulli shay'in qaderr' {there is nothing worthy of worship but Allah, He is alone without partner, to Him belongs dominion and praise, he causes life and death and He is the Living and does not die. In His Hand is all the good, and He is over all things competent.} Allah will write for him a million good deeds, erase a million of his bad deeds and raise him a million levels
Jami` at-Tirmidhi 3428
