Mahabharata 12.19.11

तपःस्वाध्यायशीला हि दृश्यन्ते धार्मिका जनाःऋषयस्तपसा युक्ता येषां लोकाः सनातनाः

tapaḥsvādhyāyaśīlā hi dṛśyante dhārmikā janāḥṛṣayastapasā yuktā yeṣāṃ lokāḥ sanātanāḥ

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