Mahabharata 14.26.8

तेषां प्रोवाच भगवाञ्श्रेयः समनुपृच्छताम्ओमित्येकाक्षरं ब्रह्म ते श्रुत्वा प्राद्रवन्दिशः

teṣāṃ provāca bhagavāñśreyaḥ samanupṛcchatāmomityekākṣaraṃ brahma te śrutvā prādravandiśaḥ

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