﴿ يَوْمَ يَبْعَثُهُمُ ٱللَّهُ جَمِيعًۭا فَيَحْلِفُونَ لَهُۥ كَمَا يَحْلِفُونَ لَكُمْ ۖ وَيَحْسَبُونَ أَنَّهُمْ عَلَىٰ شَىْءٍ ۚ أَلَآ إِنَّهُمْ هُمُ ٱلْكَٰذِبُونَ ﴾

“On the Day when God will raise them all from the dead, they will swear before Him as they [now] swear before you, thinking that they are on firm ground [in their assumptions]. Oh, verily, it is they, they who are the [greatest] liars!”

Mention the day when God will raise them all together whereupon they will swear to Him that they are believers just as they swear to you now and suppose that they are standing on something beneficial by swearing in Hereafter just as they supposed it to have been beneficial for them in this world. Yet assuredly it is they who are the liars!