When they began to sing and to praise So acceptable are the fervent prayers and praises of God's people to him, and so terrible to their enemies! The Lord set ambushments Hebrew, מארבים, mearebim, insidiantes, persons lying in wait, or plotting, and laying snares. The meaning seems to be, as appears from the next verse, that God raised jealousies and animosities among their enemies themselves, which by degrees broke forth, first into secret plots, snares, and ambushments, which one party contrived and laid for another, against which they had conceived some grudge; and then into a general confusion, and open hostilities and outrages, to the destruction of one another throughout the whole army. So vain are all men's attempts against God, who needs none to destroy his enemies but themselves, and their own mistakes and passions, which he can, when he pleases, arm against them.
Related Commentaries of 2 Chronicles 20:22
2 Chronicles 20:22
22 And whenc they began to sing and to praise, the LORD set ambushments against the children of Ammon, Moab, and mount Seir, which were come against Judah; and they were smitten.