Matthew Poole and continuators on Jeremiah 13:1

1 THus saith the LORD unto me, Go, and get thee a linnen girdle, and put it upon thy loins, and put it not in water .

Gods design by what is recorded in this chapter is by two Types, as in two Glasses to let the people understand by the Prophet, how he looked upon them, and what they were in his Eyes, and also what he would do unto them, and they might expect from him, to this purpose he directeth the Prophet to procure himself a Girdle, not woollen but linnen made of Flax or the like, and to put it not upon his clothes but upon his loins, to signifie (as some think) that this people were a people whom God had made near to him. He commands him not to put it in water, to soften it, as some think; linnen newly made, before it is wetted in water, being rough; and this they conceive the Prophet was forbidden, for a further Type of the stiffness and roughness, and stubbornness of this people. Others think, to typifie that God was no cause of this peoples rotting, and growing corrupt.