John Gill Commentary Jeremiah 13:4

"Take the girdle that thou hast bought, which is upon thy loins, and arise, go to the Euphrates, and hide it there in a cleft of the rock." — Jeremiah 13:4 (ASV)

Take the girdle which you have got, which is upon your loins , and arise, go to Euphrates, and hide it there in a hole of the rock ; by the river side, where the waters, coming and going, would reach and wet it, and it drying again, would rot the sooner. This signifies the carrying of the Jews captive to Babylon, by which city the river Euphrates ran, and the obscure state and condition they would be in there; and where all their pride and glory would be marred, as afterwards declared.