Mahabharata 5.70.33

पापकर्मात्ययायैव संकरं तेन पुष्यतिसंकरो नरकायैव सा काष्ठा पापकर्मणाम्

pāpakarmātyayāyaiva saṃkaraṃ tena puṣyatisaṃkaro narakāyaiva sā kāṣṭhā pāpakarmaṇām

Our plain-language meaning of this verse is waiting for scholar review.