Now look, God Himself is with us as our head, and His priests with sounding trumpets to sound the alarm against you. O children of Israel, do not fight against the LORD God of your fathers, for you shall not prosper!"
2 Chronicles 13:12
Surrounding context
13:11 And they burn to the LORD every morning and every evening burnt sacrifices and sweet incense; they also set the showbread in order on the pure gold table, and the lampstand of gold with its lamps to burn every evening; for we keep the command of the LORD our God, but you have forsaken Him.
13:12 Now look, God Himself is with us as our head, and His priests with sounding trumpets to sound the alarm against you. O children of Israel, do not fight against the LORD God of your fathers, for you shall not prosper!"
13:13 But Jeroboam caused an ambush to go around behind them; so they were in front of Judah, and the ambush was behind them.