The word Topheth, or Topher - variously derived from toph, "a drum" or "tabour," because the cries of the sacrificed children were drowned by the noise of such instruments; or, from a root taph or toph, meaning "to burn" - was a spot in the valley of Hinnom (marginal reference note). The later Jewish kings, Manasseh and Amon (or, perhaps, Ahaz, 2 Chronicles 28:3), had given it over to the Moloch priests for their worship; and here, ever since, the Moloch service had maintained its ground and flourished (marginal references).

He defiled Topheth - St. Jerome says that Topheth was a fine and pleasant place, well watered with fountains, and adorned with gardens. The valley of the son of Hinnom, or Gehenna, was in one part; here it appears the sacred rites of Molech were performed, and to this all the filth of the city was carried, and perpetual fires were kept up in order to consume it. Hence it has been considered a type of hell; and in this sense it is used in the New Testament.

It is here said that Josiah defiled this place that no man might make his son or his daughter to pass through the fire. He destroyed the image of Molech, and so polluted the place where he stood, or his temple, that it was rendered in every way abominable. The rabbins say that Topheth had its name from תף toph, a drum, because instruments of this kind were used to drown the cries of the children that were put into the burning arms of Molech, to be scorched to death. This may be as true as the following definition: "Topheth, or the valley of the son of Hinnom, was a place near Jerusalem, where the filth and offal of the city were thrown, and where a constant fire was kept up to consume the wretched remains of executed criminals. It was a human shambles, a public chopping-block, where the arms and legs of men and women were quartered off by thousands." Query, On what authority do such descriptions rest?

And he defiled Topheth,.... A place so called, as is generally thought, from the beating of drums or timbrels in it, that the shrieks of the infants sacrificed here to Molech might not be heard by their parents, and they repent of delivering them to him, and take them away. So the Indians in India now, at the burning of wives with their deceased husbands, attend them with drums and trumpets; and at such time as the fire is put to the wood, the drums and trumpets make a terrible noise for fear their cries should be heard (b); See Gill on Isaiah 30:33, Jeremiah 7:31 this he defiled by casting any sort of filth or unclean thing into it, in contempt of the idolatry there committed, and to alienate the minds of men from it:

which is the valley of the children of Hinnom; a valley that belonged to the posterity of a man of this name, near to Jerusalem, see Joshua 15:8, hence the Greek word "geenna" for hell, in the New Testament:

that no man might make his son or his daughter pass through the fire to Molech; which piece of idolatry used to be committed in this place.

(b) Agreement of Customs between the East Indians and Jews, art. 25. p. 85, 86.

He also defiled the place of sacrifice in the valley of Benhinnom, for the purpose of exterminating the worship of Moloch. Moloch's place of sacrifice is called התּפת, as an object of abhorrence, or one to be spat at (תּפת: Job 17:6), from תּוּף, to spit, or spit out (cf. Roediger in Ges. thes. p. 1497, where the other explanations are exploded).

(Note: Jerome (on Jeremiah 7:31) says: Thophet, quae est in valle filiorum Enom, illum locum significat, qui Silo fontibus irrigatur et est amoenus atque nemorosus, hodieque hortorum praebet delicias. From the name Gehinnom the Rabbins formed the name Γέεννα, Gehenna (Matthew 5:22, Matthew 5:29, etc.), with special reference to the children burnt here to Moloch, to signify hell and hell-fire.)

On the valley Bne or Ben-hinnom, at the south side of Mount Zion, see at Joshua 15:8.

And he defiled {k} Topheth, which is in the valley of the children of Hinnom, that no man might make his son or his daughter to pass through the fire to Molech.

(k) Which was a valley near to Jerusalem, and signifies a tabret because they smote on the tabret while their children were burning, that their cry should not be heard, Le 18:21, after which Josiah commanded trash to be cast in contempt of it.

23:10 Topheth - Very near Jerusalem, where was the image of Molech, to whom some sacrificed their children, burning them in the fire, others dedicated them, making them pass between two fires. It is supposed to be called Topheth, from toph, a drum; because they beat drums at the burning of the children, that their shrieks might not be heard.

10. Topheth-so called from Toph-a "drum." It is the prevailing opinion among Jewish writers that the cries of the terrified children made to pass through the fire in that place of idolatrous horror were drowned by the sound of that instrument.

23:4-14 What abundance of wickedness in Judah and Jerusalem! One would not have believed it possible, that in Judah, where God was known, in Israel, where his name was great, in Salem, in Zion, where his dwelling-place was, such abominations should be found. Josiah had reigned eighteen years, and had himself set the people a good example, and kept up religion according to the Divine law; yet, when he came to search for idolatry, the depth and extent were very great. Both common history, and the records of God's word, teach, that all the real godliness or goodness ever found on earth, is derived from the new-creating Spirit of Jesus Christ.