2 Chronicles 13:12

12 Therefore God is duke in our host, and his priests, that trump and sound against you; do not ye, sons of Israel, fight against the Lord God of your fathers, for it speedeth not to you. (And so God is the leader of our army, and of his priests, who be ready to sound against you with trumpets; do not, ye Israelites, fight against the Lord God of your fathers, for it shall not profit you/for ye shall not prosper.)

2 Chronicles 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.

2 Chronicles 13:12 In-Context

10 But our Lord is God, whom we forsake not; and [the] priests of the sons of Aaron minister to the Lord, and (the) deacons be in their order; (But our Lord is God, whom we will not abandon; and the priests of the sons of Aaron serve the Lord, and the Levites assist them;)

11 and they offer burnt sacrifices to the Lord by each day in the morrowtide and eventide, and also incense made by commandments of the law; and loaves be set forth in a most clean board; and at us is the golden candlestick, and the lantern thereof, that it be tended ever at eventide; and we keep the behests of our God, whom ye have forsaken. (and they offer burnt sacrifices to the Lord each day in the morning and in the evening, and also burn the incense as commanded by the Law; and the loaves be set forth on a most clean table; and with us is the gold candlestick, and its lanterns, that they light every evening; for we follow the orders, or the commands, of our God, whom ye have deserted.)

12 Therefore God is duke in our host, and his priests, that trump and sound against you; do not ye, sons of Israel, fight against the Lord God of your fathers, for it speedeth not to you. (And so God is the leader of our army, and of his priests, who be ready to sound against you with trumpets; do not, ye Israelites, fight against the Lord God of your fathers, for it shall not profit you/for ye shall not prosper.)

13 While Abijah spake these things, Jeroboam made ready treasons behind (them); and when Jeroboam stood even against his enemies, he (en)compassed (them) with his host, Judah unwitting. (And while Abijah spoke all these things, Jeroboam prepared an attack behind them; and so while Jeroboam stood in front of his enemies, he was also behind them with his army, but Judah was unwitting, or unknowing.)

14 And Judah beheld, and he saw battle nigh even against before them, and behind their back; and he cried to the Lord, and [the] priests began to trump. (But then the men of Judah looked about, and they saw that the battle was to come from in front of them, and also from behind their backs; and they cried to the Lord, and the priests began to sound their trumpets.)