Jeremiah 19:5-6

5 and gone on building the high places of Baal to burn their children in the fire as burnt offerings to Baal, which I did not command or decree, nor did it enter my mind;
6 therefore the days are surely coming, says the Lord, when this place shall no more be called Topheth, or the valley of the son of Hinnom, but the valley of Slaughter.

Jeremiah 19:5-6 Meaning and Commentary

INTRODUCTION TO JEREMIAH 19

In this chapter is foreshadowed, represented, and confirmed, the destruction of Jerusalem, by the breaking of a potter's vessel the prophet had in his hand; and by the place where he was bid to do this, and did it. The order for it, and the witnesses of it, and the place where it was done, are declared in Jer 19:1,2; the proclamation there of Jerusalem's ruin is made, Jer 19:3; the cause of it, their apostasy, idolatry, and shedding of innocent blood, Jer 19:4,5; the great slaughter of them by the sword and famine, Jer 19:6-9; and how easy, and irresistible, and irrecoverable, their destruction would be, are signified by the breaking of the bottle, Jer 19:10,11, when Jerusalem for its idolatry would become as defiled a place as Tophet, where the prophet was, Jer 19:12,13; from whence he came to the temple, and there repeated the proclamation of the evil that should come upon that city, and all the towns around it, Jer 19:14,15.

Jeremiah 19:5-6 In-Context

3 You shall say: Hear the word of the Lord, O kings of Judah and inhabitants of Jerusalem. Thus says the Lord of hosts, the God of Israel: I am going to bring such disaster upon this place that the ears of everyone who hears of it will tingle.
4 Because the people have forsaken me, and have profaned this place by making offerings in it to other gods whom neither they nor their ancestors nor the kings of Judah have known, and because they have filled this place with the blood of the innocent,
5 and gone on building the high places of Baal to burn their children in the fire as burnt offerings to Baal, which I did not command or decree, nor did it enter my mind;
6 therefore the days are surely coming, says the Lord, when this place shall no more be called Topheth, or the valley of the son of Hinnom, but the valley of Slaughter.
7 And in this place I will make void the plans of Judah and Jerusalem, and will make them fall by the sword before their enemies, and by the hand of those who seek their life. I will give their dead bodies for food to the birds of the air and to the wild animals of the earth.
8 And I will make this city a horror, a thing to be hissed at; everyone who passes by it will be horrified and will hiss because of all its disasters.