"Whoever had the weight of a speck of faith in his heart will depart from the Fire." Abu Sa'eed said: "Whoever has doubt then let him recite: Indeed Allah does not deal unjustly with even the weight of a speck."
أَنَّ النَّبِيَّ ﷺ قَالَ يُخْرَجُ مِنَ النَّارِ مَنْ كَانَ فِي قَلْبِهِ مِثْقَالُ ذَرَّةٍ مِنَ الإِيمَانِ قَالَ أَبُو سَعِيدٍ فَمَنْ شَكَّ فَلْيَقْرَأْ (إِنَّ اللَّهَ لاَ يَظْلِمُ مِثْقَالَ ذَرَّةٍ ) قَالَ هَذَا حَدِيثٌ حَسَنٌ صَحِيحٌ