Mahabharata 14.71.13

14.71.13

pṛthivīṃ paryaṭantaṃ hi turagaṃ kāmacāriṇam |
kaḥ pālayediti mune tadbhavānvaktumarhati || 13 ||

"Yudhishthira said, 'Let arrangements be made by thee, O regenerate one, about loosening this horse for enabling it to wander over the Earth at its will. It behoveth thee, O ascetic, to say who will protect this steed while roaming over the Earth freely according to its will.'