It is narrated from Hazrat Abu Saeed Khudri (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) explained the verse "wa hum feeha kalihoon" by saying that the fire of Hell will scorch him so that his upper lip will swell up and reach the middle of his head, and his lower lip will hang down to his navel.
Hadith Referenceمسند احمد / مسند المكثرين من الصحابة / 11836
Hadith Gradingحکم دارالسلام:إسناده ضعيف لضعف أبى السمح دراج فى روايته عن أبى الهيثم