Jehoshaphat became king at age 35. He followed the ways of father but even went a step further by removing the "high places" of idol worship. He cleaned out worldly hinders cars. He sent out teachers throughout the land of Judah to teach the people the law and lead them in the ways of the Lord. Because of all of this the surrounding nations greatly feared King Jehoshaphat and all Judah. They refrained from going to war with them and instead, many kings and nations brought them gifts. The surrounding nations feared the Lord even though they didn't worship Him. They feared a nation that followed Him. They were at peace with them because the nation followed God.
2 Chron 17:10 The terror of the LORD was on all the kingdoms of the lands that surrounded Judah, so they didn’t fight against Jehoshaphat. 11 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.
2 Chron 17:10 The terror of the LORD was on all the kingdoms of the lands that surrounded Judah, so they didn’t fight against Jehoshaphat. 11 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.