As for the unbelievers, their deeds will disappear like a mirage in a sandy desert, which the thirsty traveler thinks to be water, but when he comes near, he finds it to be nothing, instead he finds Allah to settle his account – Allah is swift in settling accounts.
Meaning:-
Mirage: is something that you see when it is extremely hot, for example in the desert, and which appears to be quite near but is actually a long way away or does not really exist.