Albert Barnes Commentary Jeremiah 19:2

"and go forth unto the valley of the son of Hinnom, which is by the entry of the gate Harsith, and proclaim there the words that I shall tell thee;" — Jeremiah 19:2 (ASV)

The valley ... - See Jeremiah 7:31 note.

The east gate - Others render it “the pottery gate.” Two gates led into the valley of Hinnom: the Fountain-gate at the southeast corner, and the Dung-gate on the southwest side of Zion.

Some think that “the east gate” was neither of these, but a small or postern gate used for throwing out rubbish. The valley had been put to this degrading use since the time Josiah defiled it (2 Kings 23:10).

And thus the base symbol of a proud nation was carried out through a back door to be broken upon the heaps of refuse already cast there.