Chronicles II 13:12

12 And, behold, the Lord and his priests are with us at our head, and the signal trumpets to sound an alarm over us. Children of Israel, fight not against the Lord God of our fathers; for ye shall not prosper.

Chronicles II 13:12 Meaning and Commentary

2 Chronicles 13:12

And, behold, God himself is with us for our Captain
To go before our armies, and fight our battles for us:

and his priests with sounding trumpets to cry alarm against you;
which was one use of the trumpets, that the people might be remembered by the Lord, and saved from their enemies, ( Numbers 10:9 ) , so that this circumstance was against Jeroboam and his army, and for Abijah and his:

O children of Israel, fight ye not against the Lord God of your
fathers;
for fighting against his people, that retained the pure worship of him, was fighting against him:

for you shall not prosper;
he seems to be assured of victory.

Chronicles II 13:12 In-Context

10 But we have not forsaken the Lord our God, and his priests, the sons of Aaron, and the Levites, minister to the Lord; and in their daily courses
11 they sacrifice to the Lord whole-burnt-offering, morning and evening, and compound incense, and the shewbread on the pure table; and the golden candlestick, and the lamps for burning, to light in the evening: for we keep the charge of the Lord God of our fathers; but ye have forsaken him.
12 And, behold, the Lord and his priests are with us at our head, and the signal trumpets to sound an alarm over us. Children of Israel, fight not against the Lord God of our fathers; for ye shall not prosper.
13 Now Jeroboam had caused an ambush to come round upon him from behind: and he was before Juda, and the ambush behind.
14 And Juda looked back, and, behold, the battle against them before and behind: and they cried to the Lord, and the priests sounded with the trumpets.

The Brenton translation of the Septuagint is in the public domain.