Sayyiduna Umar ibnil Khattab (RadhiAllaho anho) narrates
that indeed Rasulullah (Sallallahu Alaihi Wasallam) said:

He who enters a market and says:
( the following words )

LA-ILAHA IL-LAL-LAHU WAHDAHU LA SHAREE-KA-LAHU,
LAHUL MULKU WALA-HUL HAMDU YUHYI WAYUMEETU
WA HUWA HAYYUL LA YAMUTU BEYADIHIL-KHAIR,
WA HUWA ALA KUL-LIE SHAY-IN QADEER.

(None is worthy of worship but Allah, Who is Alone.
He has no partner, to Him belongs the dominion,
and to Him Praise is due, He gives life and causes death,
and He is the ever Living and Eternal,
and in His Hand is all the Good,
and He has Power over all things.)

Allah will record for him a million virtues,
and erases a million evils,
and elevate him by a million ranks.

{ In another narration, in place of elevating his rank by a
million it is mentioned that, a palace is built for him in Paradise.}

[ Reported by Tirmidhi ]