John Gill Commentary Jeremiah 25:2

"which Jeremiah the prophet spake unto all the people of Judah, and to all the inhabitants of Jerusalem, saying:" — Jeremiah 25:2 (ASV)

Which Jeremiah the prophet spoke to all the people of Judah
Perhaps at one of the three feasts, at which all the males appeared in Jerusalem; for it cannot be thought that he went up and down throughout all parts of the land to deliver this prophecy, but to as many of them as he found in Jerusalem in any place, at any time; and none so likely as what is mentioned.

and to all the inhabitants of Jerusalem
to whom he had an opportunity of speaking frequently.

saying
as follows: