Jeremiah 18:2

Arise, and go down to the potter's house
Which, no doubt, was well known to the prophet; but where it was is not certain. Some think Jeremiah was in the temple, and this house was beneath it, and therefore he is bid to go down to it; but of this there is no certainty, nor even probability: it is most likely that this house was without the city, perhaps near the potter's field, ( Matthew 27:10 ) ; and which lying low, he is ordered to go down to it: and there I will cause thee to hear my words;
there the Lord would tell him what he had further to say to him, and what he should say to the people; and where by lively representations, by sensible objects before him, he would cause him to understand more clearly what he said and designed to do: as God sometimes represented things to the minds of the prophets in dreams and visions, setting before them mental objects, and raising in their minds ideas of things; so sometimes he represented things to them by real visible objects, and, by similes taken from thence, conveyed unto them a clear and distinct knowledge of his mind and will, and they to the people; which was the case here.