Mahabharata 14.50.15

तपसश्चानुपूर्व्येण फलमूलाशिनस्तथात्रैलोक्यं तपसा सिद्धाः पश्यन्तीह समाहिताः

tapasaścānupūrvyeṇa phalamūlāśinastathātrailokyaṃ tapasā siddhāḥ paśyantīha samāhitāḥ

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