Allah made every act of worship performed in salaah/namaaz a means of atonement for the (minor) sins committed, and also rewarded them with a special light for praying. In fact, salaah brings forth
•light and strength into the heart,
•increases the share of one’s provision in this life,
•inspires others to love the one who prays, and
•lets Angels and also the earth with its mountains, trees and rivers rejoice..
On the day of Judgement, when the believing servants of Allah meet their Lord, their salaah shall turn into light and transform into reward.
(—• Ibn al Qayyim al Jawziyyah)