Mahabharata 12.284.18

ये चादौ ब्रह्मणा सृष्टा ब्राह्मणास्तपसा पुराते भावयन्तः पृथिवीं विचरन्ति दिवं तथा

ye cādau brahmaṇā sṛṣṭā brāhmaṇāstapasā purāte bhāvayantaḥ pṛthivīṃ vicaranti divaṃ tathā

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