After the last person is taken out
A point is reached where nobody is left except one category.
فَأَقُولُ يَا رَبِّ مَا بَقِيَ فِي النَّارِ إِلاَّ مَنْ حَبَسَهُ الْقُرْآنُ أَىْ وَجَبَ عَلَيْهِ الْخُلُودُ
My Lord, none remains in the Fire except those whom the Qur'an has detained, meaning those upon whom eternity was decreed.
The full narration
Anas b. Malik reported:The Prophet of Allah (may peace be, upon him) said: Allah will gather the believers on the Day of Resurrection and they would be made mindful of it; and the rest (of the hadith) is like the one narrated above; and then he mentioned the fourth time: And I (the Holy Prophet) would say: O my Lord, no one is left in the Fire except he whom the Qur'an has restrained, i e. eternally doomed
Source
Ṣaḥīḥ Muslim · 477
Ṣaḥīḥ
- Agreed upon as authentic (al-Bukhārī / Muslim)