A fan — Not a purging fan by affliction, to separate their chaff and dross from them, but a scattering fan. In the gates — This is added in pursuit of the metaphor of fanning, men usually chusing barn — doors to fan at, that they may have the advantage of the wind.
Related Commentaries of Jeremiah 15:7
Jeremiah 15:7
7 And I will fan them with a fan in the gates of the land; I will bereave them of children, I will destroyc my people, since they return not from their ways.