( ليكفر الله عنهم أسوأ الذي عملوا ) يسترها عليهم بالمغفرة ، ( ويجزيهم أجرهم بأحسن الذي كانوا يعملون ) قال مقاتل : يجزيهم بالمحاسن من أعمالهم ولا يجزيهم بالمساوئ .
So that Allah erases from them the worst sins that they used to do in the world, as they had repented from them and had turned towards their Lord, and rewards them according to the best deeds that they used to do.