Overall meaning : The Almighty says: In whatever activity you may be engaged and whatever surah of the Qur’an you recite, Muhammad, and whatever you people do, be it good or bad, small or big, Allah is certainly witness over you when you engage in it and is fully aware of whatever you do; He keeps count of all that, and He will repay you according to your actions.
Not even as much as the weight of an ant in the earth or in the heavens escapes your Lord, nor is there anything smaller than that, or greater, but it is written in the Preserved Tablet, in which everything is recorded.
Indeed, Allah’s righteous servants whom He gives help and support and for whom He shows His love and care will have nothing whatsoever to fear in the hereafter, nor will they grieve for whatever they leave behind in the life of the world. They are those who believe in what they ought to believe in and are mindful of Him by doing what He commands and avoiding what He forbids. Theirs are good tidings in the life of the world and in the hereafter. There is no changing the words of Allah, and His promise cannot be unfulfilled. That is the supreme triumph.