﴿ إِلَّا ٱلَّذِينَ ءَامَنُوا۟ وَعَمِلُوا۟ ٱلصَّٰلِحَٰتِ فَلَهُمْ أَجْرٌ غَيْرُ مَمْنُونٍۢ ﴾

“excepting only such as attain to faith and do good works: and theirs shall be a reward unending!”

(Save those who believe) in Muhammad (pbuh) and the Qur'an (and do good works) and do acts of obedience in private between themselves and their Lord, (and theirs is a reward unfailing) their reward is undiminished and unspoilt, good deeds will still be written for them even in old age and after they die.