Jeremiah 19:6

therefore, behold, the days come, saith the Lord, that this place shall no more be called Tophet, a name thought by some commentators to have been given to the place because drums (Hebrew, toph) were beaten to drown out the cries of the children that were being sacrificed, nor The Valley of the Son of Hinnom, but The Valley of Slaughter, where the enemies would descend upon the men of Judah to cut them down unmercifully.