Jeremiah 4:8

For this calamity the people was to mourn deeply. For the description of the mourning, cf. Joe 1:13; Mic 1:8. For the wrath of the Lord has not turned from us, as in blind self-delusion ye imagine, Jer 2:35. The heath of Jahveh's anger is the burning wrath on account of the sins of Manasseh, with which the people has been threatened by the prophets. This wrath has not turned itself away, because even under Josiah the people has not sincerely returned to its God.

It should seem that the first two verses of this chapter might better have been joined to the close of the foregoing chapter, for they are directed to Israel, the ten tribes, by way of reply to their compliance with God's call, directing and encouraging them to hold their resolution (Jer 4:1, Jer 4:2). The rest of the chapter concerns Judah and Jerusalem. I. They are called to repent and reform (Jer 4:3, Jer 4:4). II. They are warned of the advance of Nebuchadnezzar and his forces against them, and are told that it is for their sins, from which they are again exhorted to wash themselves (Jer 4:5-18). III. To affect them the more with the greatness of the desolation that was coming, the prophet does himself bitterly lament it, and sympathize with his people in the calamities it brought upon them, and the plunge it brought them to, representing it as a reduction of the world to its first chaos (Jer 4:19-31).

4:8 The Israelites were in trouble with the Lord and needed to make things right with him. Putting an army in the field or organizing guerrilla bands would be futile. Instead, Jeremiah called for the people to repent by mourning and by weeping with broken hearts (Isa 22:12). By using the pronoun us, the prophet seems to include himself in the need for repentance (see Jer 10:24).