Mahabharata 12.113.5

तपसस्तस्य चान्ते वै प्रीतिमानभवत्प्रभुःवरेण छन्दयामास ततश्चैनं पितामहः

tapasastasya cānte vai prītimānabhavatprabhuḥvareṇa chandayāmāsa tataścainaṃ pitāmahaḥ

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