2 Chronicles 11:13-17

The priests and Levites from all over Israel came and made themselves available to Rehoboam. The Levites left their pastures and properties and moved to Judah and Jerusalem because Jeroboam and his sons had dismissed them from the priesthood of GOD and replaced them with his own priests to preside over the worship centers at which he had installed goat and calf demon-idols. Everyone from all the tribes of Israel who determined to seek the GOD of Israel migrated with the priests and Levites to Jerusalem to worship there, sacrificing to the GOD of their ancestors. That gave a tremendous boost to the kingdom of Judah. They stuck with Rehoboam son of Solomon for three years, loyal to the ways of David and Solomon for this period.