John Gills Exposition of the Bible Commentary - Jeremiah 7:31
And they have built the high places of Tophet ,.... Where was the idol Moloch; and which place had its name, as Jarchi thinks, from the beating of drums, that the parents of the children that were burnt might not hear the cry of them: which is in the valley of the son of Hinnom; a valley near Jerusalem, and lay to the south of it, Joshua 15:8 , to burn their sons and their daughters in the fire : which was done, as Jarchi says, by putting them into the arms of the brasen image Moloch,... read more
Matthew Henry's Complete Commentary - Jeremiah 7:29-34
Here is, I. A loud call to weeping and mourning. Jerusalem, that had been a joyous city, the joy of the whole earth, must now take up a lamentation on high places (Jer. 7:29), the high places where they had served their idols; there must they now bemoan their misery. In token both of sorrow and slavery, Jerusalem must now cut off her hair and cast it away; the word is peculiar to the hair of the Nazarites, which was the badge and token of their dedication to God, and it is called their crown.... read more