1 Kings 12:20-21

12:20 When all Israel heard that Jeroboam had returned, they summoned him to the assembly and made him king over all Israel. No one except the tribe of Judah remained loyal to the Davidic dynasty.

12:21 When Rehoboam arrived in Jerusalem, he summoned 180,000 skilled warriors from all of Judah and the tribe of Benjamin to attack Israel and restore the kingdom to Rehoboam son of Solomon.

1 Kings 18:19

18:19 Now send out messengers and assemble all Israel before me at Mount Carmel, as well as the 450 prophets of Baal and 400 prophets of Asherah whom Jezebel supports.