Mahabharata 13.144.29

आशीविषविषं तीक्ष्णं ततस्तीक्ष्णतरं विषम्ब्रह्माशीविषदग्धस्य नास्ति कश्चिच्चिकित्सकः

āśīviṣaviṣaṃ tīkṣṇaṃ tatastīkṣṇataraṃ viṣambrahmāśīviṣadagdhasya nāsti kaściccikitsakaḥ

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