Mahabharata 13.118.25

नृशंसगुणभूयिष्ठं पुरा कर्म कृतं मयास्मृत्वा तदनुतप्येऽहं त्यक्त्वा प्रियमिवात्मजम्

nṛśaṃsaguṇabhūyiṣṭhaṃ purā karma kṛtaṃ mayāsmṛtvā tadanutapye'haṃ tyaktvā priyamivātmajam

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