Mahabharata 9.38.26

विज्ञायातीतवयसं रुषङ्गुं ते तपोधनाःतं वै तीर्थमुपानिन्युः सरस्वत्यास्तपोधनम्

vijñāyātītavayasaṃ ruṣaṅguṃ te tapodhanāḥtaṃ vai tīrthamupāninyuḥ sarasvatyāstapodhanam

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