Matsya Purana 181.23

181.23

avimuktaṃ yadāgacchet kadācit kālaparyayāt.
aśmanā caraṇau baddhvā tatraiva nidhanaṃ vrajet .. 180.23 ..

Far better it is for one when he goes to Kâśi, to fix himself down to the earth, by tying a piece of stone on his legs, and never leave this place, and thereby enable him to go to My realm — 23 24