(Maryam) 19 : 75
قُلْ مَنْ كَانَ فِي الضَّلَالَةِ فَلْيَمْدُدْ لَهُ الرَّحْمَٰنُ مَدًّا ۚ حَتَّىٰ إِذَا رَأَوْا مَا يُوعَدُونَ إِمَّا الْعَذَابَ وَإِمَّا السَّاعَةَ فَسَيَعْلَمُونَ مَنْ هُوَ شَرٌّ مَكَانًا وَأَضْعَفُ جُنْدًا
You say: "Whoever is in astray, then the Impartial let him go astray until, when they see either punishment or the Last Hour that which they were promised, they will come to know who is worst in position and weaker in forces".
It is told in verse 72: 24: “Until, when the disbelievers see which they are promised, then they will know who is weaker in helpers and less in number”. In the case of individuals, the Last Hour is their death; and in the case of whole mankind, it is the Doomsday. See explanation 7: 37 and 9: 84-85.