“because there is no place left to bury.” This is a horrifying prophecy. No Jew would want their body buried in Topheth because of all the dead bones scattered there. Yet we know that in the future, at the Battle of Armageddon, there will be so many dead bodies that the blood from the slain will flow for 180 miles (Rev. 14:20). Isaiah 34:3 hyperbolically expresses the huge volume of blood by saying that there is so much blood rushing down the mountains that it “melts” them; it carries them away. Here in Jeremiah 7:32 it is foretold that Judah will be so full of graves that people will be forced to bury the dead in the Valley of the Son of Hinnom,” (in Greek, Gehenna) because there is no room anywhere else to bury them.
However, as unclean as the Valley of Hinnom will become at the time of Armageddon, it will be cleaned up in Christ’s Millennial Kingdom on earth (Jer. 31:40; cp. Ezek. 39:14-15).
“Topheth.” A place where children were burned as human sacrifices (see commentary on 2 Kings 23:10). Over time the area where that was done must have been referred to as Topheth, as we see in Jeremiah 7:32, 19:6, 11.