Jeremiah 6:21 - Matthew Poole's English Annotations on the Holy Bible

I will lay stumbling-blocks; God gives this name to all the occasions of the Jews ruin; 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 judgments 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. The fathers and the sons together; 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, Isaiah 8:14,15. The neighbour and his friend; 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, Jeremiah 6:11 Jeremiah 13:14.