One day will Allah raise them all up (for Judgment): then will they swear to Him as they swear to you: And they think that they have something (to stand upon). No, indeed! they are but liars! (18)
Tafsir
When a self-seeking man opposes the call for Truth, he thinks that he is thus making himself safe. But in the Hereafter, when he sees that the things on which he relied are of no avail on the day of judgement, he will be struck with horror. A hypocrite, in order to vindicate his position, indulges in tall talk to the extent of taking oaths as an assurance of his sincerity. After doing all this, he thinks that he has been very clever and that he has provided some support for himself. But when the blast of Doomsday opens the secrets of realities, he will come to know at that time that his attempts at vindication were simply a series of false words taught by Satan as ‘certain proof’ of his innocence.
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