Charles Spurgeon Commentary 2 Chronicles 11:5-15

"And Rehoboam dwelt in Jerusalem, and built cities for defence in Judah. He built Beth-lehem, and Etam, and Tekoa, And Beth-zur, and Soco, and Adullam, and Gath, and Mareshah, and Ziph, and Adoraim, and Lachish, and Azekah, and Zorah, and Aijalon, and Hebron, which are in Judah and in Benjamin, fortified cities. And he fortified the strongholds, and put captains in them, and stores of victuals, and oil and wine. And in every city [he put] shields and spears, and made them exceeding strong. And Judah and Benjamin belonged to him. And the priests and the Levites that were in all Israel resorted to him out of all their border. For the Levites left their suburbs and their possession, and came to Judah and Jerusalem: for Jeroboam and his sons cast them off, that they should not execute the priest`s office unto Jehovah; and he appointed him priests for the high places, and for the he-goats, and for the calves which he had made." — 2 Chronicles 11:5-15 (ASV)

No wonder, therefore, that Rehoboam's kingdom was strengthened by the advent of these men, who were, doubtless, the best men in the whole country, men who feared the Lord, men who knew the law, and who knew how to teach the people what they should do.