Judah, led by King Abijah, fielded 400,000 seasoned warriors, while Jeroboam mustered 800,000 courageous men from Israel.
When the army of Judah arrived in the hill country of Ephraim, Abijah stood on Mount Zemaraim and shouted to Jeroboam and the Israelite army: "Listen to me!
Don't you realize that the LORD, the God of Israel, made an unbreakable covenant with David, giving him and his descendants the throne of Israel forever?
References for 2 Chronicles 13:5
Yet Jeroboam son of Nebat, who was a mere servant of David's son Solomon, became a traitor to his master.
Then a whole gang of scoundrels joined him, defying Solomon's son Rehoboam when he was young and inexperienced and could not stand up to them.
Do you really think you can stand against the kingdom of the LORD that is led by the descendants of David? Your army is vast indeed, but with you are those gold calves that Jeroboam made as your gods!
And you have chased away the priests of the LORD and the Levites and have appointed your own priests, just like the pagan nations. You let anyone become a priest these days! Whoever comes to be dedicated with a young bull and seven rams can become a priest of these so-called gods of yours!"
"But as for us, the LORD is our God, and we have not abandoned him. Only the descendants of Aaron serve the LORD as priests, and the Levites alone may help them in their work.
They present burnt offerings and fragrant incense to the LORD every morning and evening. They place the Bread of the Presence on the holy table, and they light the gold lampstand every evening. We are following the instructions of the LORD our God, but you have abandoned him.
So you see, God is with us. He is our leader. His priests blow their trumpets and lead us into battle against you. O people of Israel, do not fight against the LORD, the God of your ancestors, for you will not succeed!"
Meanwhile, Jeroboam had secretly sent part of his army around behind the men of Judah to ambush them.