And on the Day when He will gather them, [it will be] as if they had not remaine-Quran Verses

10-Surah Yunus ( Jonah ) 45

And on the Day when He will gather them, [it will be] as if they had not remained [in the world] but an hour of the day, [and] they will know each other. Those will have lost who denied the meeting with Allah and were not guided

﴿45﴾وَيَوْمَ يَحْشُرُهُمْ كَأَن لَّمْ يَلْبَثُوا إِلَّا سَاعَةً مِّنَ النَّهَارِ يَتَعَارَفُونَ بَيْنَهُمْ ۚ قَدْ خَسِرَ الَّذِينَ كَذَّبُوا بِلِقَاءِ اللَّهِ وَمَا كَانُوا مُهْتَدِينَ

Quran's Tafhim ( explanation)

*53). A time will come when such people will, on the one hand, come face to face with the infinite life of the Hereafter, and on the other, they will took back at their past worldly life and realize how puny it was as compared to the life ahead. It is then that they will comprehend what folly they have committed by ruining their eternal future for the sake of ephemeral pleasures and benefits in this worldly life.
*54). This refers to the unbelievers' rejection that a time will come when everyone will have to stand before God for His judgement.