Verse 29. "Cut off thine hair" - ūrzn yzg gozzi nizrech, shear thy nazarite. The Nazarite was one who took upon him a particular vow, and separated himself from all worldly connections for a certain time, that he might devote himself without interruption to the service of God; and during all this time no razor was to pass on his head, for none of his hair was to be taken off. After the vow was over, he shaved his head and beard, and returned to society. See Num. vi. 2, &c., and the notes there.
Jerusalem is here considered under the notion of a Nazarite, by profession devoted to the service of God: but that profession was empty; it was not accompanied with any suitable practice. God tells them here to cut off their hair; to make no vain pretensions to holiness or religion; to throw off the mask, and attempt no longer to impose upon themselves and others by their hypocritical pretensions. On the same ground he orders them, ver. 21, to devote to common use the animals destined for sacrifice; and to make no more vain shows of religion while their hearts were not right with him. Dr. Blayney thinks the address is to the prophet, who was a Nazarite by virtue of his office, and who was called to cut off his hair as a token of mourning for the desolations which were coming upon his people. That cutting off the hair was a sign of distress and mourning may be seen, Ezra ix. 3; Isaiah xv. 2; chap. xli. 5, &c. But I think the other the more natural construction.
"On high places" - That the lamentation may be heard to the greater distance.
"The generation of his wrath." - Persons exposed to punishment: used here as children of wrath, Eph. ii. 3.
Verse 31. "Tophet-in the valley of the son of Hinnom" - Tophet was the place in that valley where the continual fires were kept up, in and through which they consecrated their children to Moloch.
Verse 32. "The valley of slaughter" - The place where the slaughtered thousands of this rebellious people shall be cast, in order to their being burnt, or becoming food for the beasts of the field and the fowls of the air, ver. 33. These words are repeated, and their meaning more particularly explained, chap. xix. 6-15.
Verse 34. "Then will I cause to cease-the voice of mirth" - There shall no longer be in Jerusalem any cause of joy; they shall neither marry nor be given in marriage, for the land shall be totally desolated. Such horrible sins required such a horrible punishment. And they must be horrible, when they move God to destroy the work of his own hands.