The order given after everyone is placed
It comes after the Garden and the Fire are already settled.
أَخْرِجُوا مَنْ كَانَ فِي قَلْبِهِ مِثْقَالُ حَبَّةٍ مِنْ خَرْدَلٍ مِنْ إِيمَانٍ
Akhrijū man kāna fī qalbihi mithqālu ḥabbatin min khardalin min īmān
“Bring out whoever had in his heart the weight of a mustard seed of faith.”
Where this comes from
They come out burnt and are thrown into a river, and they grow the way a seed grows in whatever the flood leaves behind at the edge of a stream. He said: have you not seen how it comes out yellow and bent.
The full narration
Narrated Abu Said Al-Khudri: The Prophet (ﷺ) said, "When the people of Paradise will enter Paradise and the people of Hell will go to Hell, Allah will order those who have had faith equal to the weight of a grain of mustard seed to be taken out from Hell. So they will be taken out but (by then) they will be blackened (charred). Then they will be put in the river of Haya' (rain) or Hayat (life) (the Narrator is in doubt as to which is the right term), and they will revive like a grain that grows near the bank of a flood channel. Don't you see that it comes out yellow and twisted?
Source
Ṣaḥīḥ al-Bukhārī · 22
- Agreed upon as authentic (al-Bukhārī / Muslim)