Sahih Bukhari

The Prophet (ﷺ) said, "When the people of Paradise will enter Paradise andthe people of Hell will go to Hell, Allah will order those who havehad faith equal to the weight of a grain of mustard seed to be takenout from Hell. So they will be taken out but (by then) they will beblackened (charred). Then they will be put in the river of Haya'(rain) or Hayat (life) (the Narrator is in doubt as to which is theright term), and they will revive like a grain that grows near thebank of a flood channel. Don't you see that it comes out yellow andtwisted"