Mahabharata 12.2.13

ब्रह्मास्त्रं ब्राह्मणो विद्याद्यथावच्चरितव्रतःक्षत्रियो वा तपस्वी यो नान्यो विद्यात्कथंचन

brahmāstraṃ brāhmaṇo vidyādyathāvaccaritavrataḥkṣatriyo vā tapasvī yo nānyo vidyātkathaṃcana

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