Matthew Poole and continuators on Jeremiah 6:21

21 Therefore thus saith the LORD, Behold, I will lay stumbling blocks before this people, and the fathers, and the sons together shall fall upon them: the neighbour and his friend shall perish.

God gives this name to all the occasions of the Iews ruine, he exposeth them, or suffereth such things to be laid in their way, as shall be the occasion of their destruction, such things, which they shall not get over, or an hypallage I will bring destruction upon them, as the Hebrews use to speak, they have sent a City into the Fire, i. e. they have sent Fire into the City. Or God doth here compare his judgements, to traps, wherein they shall be taken, which they thought easily to have evaded; what these stumbling blocks are, seem to be expressed in the following verses.

As well the Fathers, that have more prudence, and policy, as the Children that are more inadvertent, or possibly may count themselves less guilty, shall perish by these stumbling blocks, no recovering for themselves, Isa. 8.14, 15.

Men of all sorts and conditions, the greatest intimates, and associates, though all lay their heads together for counsel, yet shall they not be able to help one another, but a promiscuous destruction there shall be. ver. 11. chap. 13, 14.