Jeremiah often wrote prophecy in the form of poetry. Hebrew poetry uses different kinds of parallelism. (See: [[rc://en/ta/man/translate/writing-poetry]] and [[rc://en/ta/man/translate/figs-parallelism]])
Possible meanings are 1) that these are the words of Yahweh referring to himself as "we." AT: "I have heard" or 2) that these are the words of the people of Jerusalem. AT: "You people of Jerusalem say, 'We have heard'"