John Gills Exposition of the Bible Commentary - Jeremiah 7:30
For the children of Judah have done evil in my sight, saith the Lord ,.... Meaning not a single action only, but a series, a course of evil actions; and those openly, in a daring manner, not only before men, but in the sight of God, and in contempt of him, like the men of Sodom, Genesis 13:13 , they have set their abominations in the house which is called by my name, to defile it ; that is, set their idols in the temple; here Manasseh set up a graven image of the grove, 2 Kings 21:7 ... 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