Mahabharata 3.34.70

एतद्ध्यपि तपो राजन्पुराणमिति नः श्रुतम्विधिना पालनं भूमेर्यत्कृतं नः पितामहैः

etaddhyapi tapo rājanpurāṇamiti naḥ śrutamvidhinā pālanaṃ bhūmeryatkṛtaṃ naḥ pitāmahaiḥ

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