Explanatory Notes on the Whole Bible, by John Wesley, [1754-65], at sacred-texts.com
jer 19:4This place - Either this city, or this valley, which they had turned to an use quite contrary to the end for which God gave it them.
jer 19:5To burn - This and the following verse, contain another great sin of this people, with the punishment which God proportions to it. The sin in the general was idolatry, but a most barbarous species of it, mentioned also Jer 7:31, Jer 32:35, where it is said, they made their sons and their daughters pass thro' the fire to Molech; the place where they did it is called Tophet, Jer 19:6, of which also mention is made, Isa 30:33. Baal and Molech, signify the same thing; Baal signifies a Lord, Molech a King. Both Baal and Molech seem common names to all idols.
jer 19:7In this place - In this place, among others, I will make void all the counsels that the men of Judah and the inhabitants of Jerusalem, have taken to escape my righteous judgments.
jer 19:12As Tophet - That is, a place of slaughter and burials.
jer 19:14Then - Jeremiah had now dispatched the errand upon which God had sent him to Tophet, coming back by God's direction, he stands in the court, which was common to all people, where the most might hear.