Translation:

18. 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!

Notes (Tafseer)

5359. When Judgment is established, and before they the Truth, they may think (as now) that some oaths or excuses will save them. But they have not now-much less will they have then-any footing to stand upon. Falsehood is falsehood, and must perish. They must learn the worthlessness of their falsehood.