﴿ وَلَئِنْ أَذَقْنَٰهُ رَحْمَةًۭ مِّنَّا مِنۢ بَعْدِ ضَرَّآءَ مَسَّتْهُ لَيَقُولَنَّ هَٰذَا لِى وَمَآ أَظُنُّ ٱلسَّاعَةَ قَآئِمَةًۭ وَلَئِن رُّجِعْتُ إِلَىٰ رَبِّىٓ إِنَّ لِى عِندَهُۥ لَلْحُسْنَىٰ ۚ فَلَنُنَبِّئَنَّ ٱلَّذِينَ كَفَرُوا۟ بِمَا عَمِلُوا۟ وَلَنُذِيقَنَّهُم مِّنْ عَذَابٍ غَلِيظٍۢ ﴾

“Yet whenever We let him taste some of Our grace after hardship has visited him, he is sure to say, “This is but my due!” - and, “I do not think that the Last Hour will ever come: but if [it should come, and] I should indeed be brought back unto my Sus­tainer, then, behold, the ultimate good awaits me with Him! But [on the Day of Judgment] We shall most cer­tainly give those who were bent on denying the truth full understanding of all that they ever did, and shall most certainly give them [thereby] a taste of suffering severe.”

And if wa-la-in the lām is for oaths We let him taste if We bestow on him mercy such as riches or good health from Us after the harm the hardship or tribulation that had befallen him he will surely say ‘This is my due! in other words it is on account of what I do. I do not think that the Hour will ever set in and even if wa-la-in the lām is for oaths I am returned to my Lord I will indeed have the best reward with Him’ namely Paradise. But We will assuredly inform those who disbelieve of what they did and assuredly We will make them taste a harsh chastisement the lām prefixed in both verbs is that for oaths.