Tophet
Tophet is a named Molech-and-Baal installation inside the valley of the son (or sons) of Hinnom, on the southern edge of Jerusalem, where Judahites burned their sons and daughters in the fire to Molech and to Baal. The site moves through scripture along a single arc: it is first located on the tribal border of Judah and Benjamin, then becomes the active fire-pyre of the late kings of Judah, then is defiled by Josiah, then is announced by Jeremiah and Isaiah as the renamed valley of Slaughter and as a divinely-prepared burning-place — kindled, in Isaiah, by the [Speech] of Yahweh himself.
The Valley of Hinnom
Tophet sits inside the geographically defined valley of the son of Hinnom. The two earliest references locate it on the tribal border. Joshua traces Judah's northern border "by the valley of the son of Hinnom to the side of the Jebusite southward (the same is Jerusalem)" and onward "to the top of the mountain that lies before the valley of Hinnom westward, which is at the uttermost part of the valley of Rephaim northward" (Jos 15:8). The matching survey of Benjamin's southern border runs the line "to the uttermost part of the mountain that lies before the valley of the son of Hinnom, which is in the valley of Rephaim northward; and it went down to the valley of Hinnom, to the side of the Jebusite southward, and went down to En-rogel" (Jos 18:16). The valley is thus a fixed feature of the Jerusalem topography from the conquest onward — adjacent to the Jebusite city, joined to the valley of Rephaim, and meeting En-rogel below.
Child-Sacrifice in the Hinnom Valley
The Molech-and-Baal worship that gives Tophet its later notoriety is staged inside this same valley. Ahaz "burned incense in the valley of the son of Hinnom, and burned his sons in the fire, according to the disgusting behaviors of the nations whom Yahweh cast out before the sons of Israel" (2Ch 28:3). Manasseh repeats the act: "He also made his sons to pass through the fire in the valley of the son of Hinnom; and he interpreted omens, and used magic, and did witchcraft, and dealt with spiritists and with wizards: he wrought much evil in the sight of Yahweh, to provoke him to anger" (2Ch 33:6). Jeremiah names the same high-place installations explicitly: "And they have built the high places of Topheth, which is in the valley of the son of Hinnom, to burn their sons and their daughters in the fire; which I did not command, neither did it come into my mind" (Jer 7:31). And again, with Baal added to the indictment: "And they built the high places of Baal, which are in the valley of the son of Hinnom, to cause their sons and their daughters to pass through [the fire] to Molech; which I did not command them, neither did it come it into my mind, that they should do this disgusting thing, to cause Judah to sin" (Jer 32:35). Tophet is therefore exhibited across these passages as the named site of a single composite Molech-and-Baal worship — a high-place complex in the Hinnom valley where children were burned to Molech and Baal under successive kings of Judah.
Josiah's Defilement
Josiah's reform shuts the installation down by ritual defilement. "And he defiled Topheth, which is in the valley of the sons of Hinnom, that no man might make his son or his daughter to pass through the fire to Molech" (2Ki 23:10). The defilement targets exactly the Molech-rite named in Jeremiah and Chronicles — the son-or-daughter fire-passing to Molech — and renders the named installation ritually unusable.
Jeremiah's Oracle from Tophet
Jeremiah's oracles fix Tophet at the center of the coming judgment on Jerusalem. Yahweh sends him out "to the valley of the son of Hinnom, which is by the entry of the gate Harsith, and proclaim there the words that I will tell you" (Jer 19:2). The oracle Yahweh hands him is a twofold renaming and a burial-saturation. First, the renaming: "Therefore, look, the days come, says Yahweh, that it will no more be called Topheth, nor The valley of the son of Hinnom, but The valley of Slaughter: for they will bury in Topheth, until there is no place [to bury]" (Jer 7:32) — repeated in the Jer 19 setting: "therefore, look, the days come, says Yahweh, that this place will no more be called Topheth, nor The valley of the son of Hinnom, but The valley of Slaughter" (Jer 19:6). Second, the burial-saturation, fastened to the shattered-pottery sign: "and they will bury in Topheth, until there is no place to bury" (Jer 19:11). The named pyre site is exhibited as becoming the corpse-burial site for the very people whose children it had earlier consumed — until no place remains for burying.
The judgment then expands beyond the valley to take in the city itself. "Thus I will do to this place, says Yahweh, and to its inhabitants, even making this city as Topheth: and the houses of Jerusalem, and the houses of the kings of Judah, which are defiled, will be as the place of Topheth, even all the houses on whose roofs they have burned incense to all the host of heaven, and have poured out drink-offerings to other gods" (Jer 19:12-13). The defiled Jerusalem houses, including the royal houses, are equated with Topheth itself. Jeremiah then closes the oracle on the spot where it began: "Then Jeremiah came from Topheth, where Yahweh had sent him to prophesy; and he stood in the court of Yahweh's house, and said to all the people" (Jer 19:14).
A Topheth Prepared by Yahweh
Isaiah closes the arc with a reversal. The named burning-site, formerly built by Judah for child-fire, is exhibited as a Topheth prepared by Yahweh himself for the king of the oppressor: "For a Topheth is prepared of old; yes, for the king it is made ready; he has made it deep and large; its pile is fire and much wood; the [Speech] of Yahweh, like a stream of brimstone, kindles it" (Isa 30:33). The deep-and-large pit is stacked with fire and much wood, and the kindler is the Yahweh-[Speech], operating as a brimstone-stream. The site that began as a high-place for burning sons and daughters ends as the prepared destruction-pit kindled by the divine Speech itself.