What did the Prophet Muhammad (peace be upon him) say about those who have faith equal to the weight of a grain of mustard seed being taken out from Hell?
      Narrated Abu Said Al-Khudri:                          The Prophet 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"