Mahabharata 15.26.10

तथा शैलालयो राजा भगदत्तपितामहःतपोबलेनैव नृपो महेन्द्रसदनं गतः

tathā śailālayo rājā bhagadattapitāmahaḥtapobalenaiva nṛpo mahendrasadanaṃ gataḥ

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