I have said that there is here a new prophecy, for the Prophet is said to buy for himself a girdle or a belt, or, according to some, a truss or bre…

So I went and hid it by Euphrates
Or, "in" ^F15 it; in a hole of the rock, upon the banks of it: <…

It was common for the prophets to teach by signs. And we have the explanation in Jeremiah 13:9-11.

Here, the prophet shows the dignity of the people based on their connection to God.