Matthew Henry on 2 Chronicles 20:14-19
We have here God's gracious answer to Jehoshaphat's prayer; and it was a speedy answer. While he was yet speaking God heard: before the congregation was dismissed they had assurance given them that they should be victorious; for it is never in vain to seek God. 1. The spirit of prophecy came upon a Levite that was present, not in any place of eminency, but in the midst of the congregation, Ch2 20:14. The Spirit, like the wind, blows where and on whom he listeth. He was of the sons of Asaph, and therefore one of the singers; on that office God would put an honour. Whether he was a prophet before this or no is uncertain, most probably he was, which would make him the more regarded. There neede…
Read the whole note in the consoleJamieson-Fausset-Brown on 2 Chronicles 20:16
they come up by the cliff of Ziz--This seems to have been nothing else than the present pass which leads northwards, by an ascent from En-gedi to Jerusalem, issuing a little below Tekoa. The wilderness of Jeruel was probably the large flat district adjoining the desert of Tekoa, called El-Husasah, from a wady on its northern side [ROBINSON].
Adam Clarke on 2 Chronicles 20:15
For the battle is not yours, but God's - God will not employ you in the discomfiture of this great host; he himself will take the matter in hand, deliver you, and destroy them.
John Gill on 2 Chronicles 20:16
Tomorrow go ye down against them,.... This was the fast day, and so not proper to march out in, but on the morrow they might go out with great confidence and intrepidity; and as Jerusalem was situated on an eminence, they are directed to go down:
behold, they come up by the cliff of Ziz; a steep hill, so called from the flowers upon it:
and ye shall find them at the end of the brook; on the bank of Kidron, according to Beckius, which seems not likely to be meant, since they went as far as the wilderness of Tekoa, 2 Chronicles 20:20,
before the wilderness of Jeruel; the same with that of Tekoa, or near it.