Mahabharata 3.135.31

यवक्रीतस्य यत्तीर्थमुचितं शौचकर्मणिभागीरथ्यां तत्र सेतुं वालुकाभिश्चकार सः

yavakrītasya yattīrthamucitaṃ śaucakarmaṇibhāgīrathyāṃ tatra setuṃ vālukābhiścakāra saḥ

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