https://www.btstories.com/jehoshaphat-ahab/

After Asa died, his son Jehoshaphat became king of Judah. The Lord was with him, and he followed the example of King David.

The first thing he did was make the nation more secure. He also set up an educational program so people could understand God’s Laws. The Lord made the surrounding nations fear Jehoshaphat, so they didn’t want to go to war with him.