According to this hadith, those who recite La ilaha illallahu, wahdahu la sharika lahu, lahul-mulku wa lahul-hamdu, wa Huwa ala kulli sha’in Qadir 100 times in a day would be rewarded as if they freed 10 slaves, would receive 100 credit and 100 sins will be forgiven.
In the Quran there’s an ayah (5:6) which says “Allah does not intend to make difficulty for you”, just the simple recitation of this phrase one hundred times and you will be the receiver of an extensive reward.
And spend in the way of Allāh and do not throw [yourselves] with your [own] hands into destruction [by refraining]. And do good; indeed, Allāh loves the doers of good.