In the third year of his reign, Jehoshaphat sent his officials-Ben-hail, Obadiah, Zechariah, Nethanel, and Micaiah-to teach in the cities of Judah.
References for 2 Chronicles 17:7
The Levites with them were Shemaiah, Nethaniah, Zebadiah, Asahel, Shemiramoth, Jehonathan, Adonijah, Tobijah, and Tob-adonijah; the priests, Elishama and Jehoram, were with these Levites.
References for 2 Chronicles 17:8
They taught throughout Judah, [having] the book of the Lord's instruction with them. They went throughout the towns of Judah and taught the people.
The terror of the Lord was on all the kingdoms of the lands that surrounded Judah, so they didn't fight against Jehoshaphat.
Some of the Philistines also brought gifts and silver as tribute to Jehoshaphat, and the Arabs brought him flocks: 7,700 rams and 7,700 male goats.