2 Chronicles 13:17 in the World English Bible
Abijah and his people killed them with a great slaughter, so five hundred thousand chosen men of Israel fell down slain.
Context
16 And the children of Israel fled before Judah: and God delivered them into their hand.
17 And Abijah and his people slew them with a great slaughter: so there fell down slain of Israel five hundred thousand chosen men.
18 Thus the children of Israel were brought under at that time, and the children of Judah prevailed, because they relied upon the LORD God of their fathers.