Sayyiduna Abu Sa'id Khudri (may Allah be pleased with him) narrates this statement of the Noble Prophet (peace and blessings be upon him): "The people of Paradise will enter Paradise, and the people of Hell will enter Hell. Then Allah Almighty will say: Review those people—whoever you find in his heart even a mustard seed's weight of faith, take him out (from Hell).” The Noble Prophet (peace and blessings be upon him) says: “So those people will come out of Hell in such a state that, after being burnt, they will have become like charcoal. They will be thrown into the River of Life, and they will burst forth from it just as a seed bursts forth on the bank of a flood stream.” The Noble Prophet (peace and blessings be upon him) said: “Have you not seen it, how it is yellow in color and sways here and there?”
Hadith Referenceصحیح ابن حبان / كتاب الإيمان / 222
Hadith Gradingفضيلة الشيخ الإمام محمد ناصر الدين الألبانيصحيح - «الظلال» (842)، ومضى نحوه (182): ق.فضيلة الشيخ العلّامة شُعيب الأرناؤوطإسناده صحيح. الربيع بن سليمان: ثقة، ومن فوقه رجال الشيخين.