When we behold Jehoshaphat, and his court, and army, his teachers, among the princes and the schools, which he had established through his kingdom, we are led to conclude that Judah, during his reign must have been in a state of great happiness and prosperity. That sweet song which David sung in his days might have been sung by Jehoshaphat in his. For it was the same Lord which giveth salvation unto kings that delivered him, as well as David, from the peril of the sword. Happy is the people that is in such a case; yea, happy is that people whose God is the Lord. Psalms 144:15.
2 Chronicles 17:12-19
12 And Jehoshaphat waxed great exceedingly; and he built in Judah castles,b and cities of store.
13 And he had much business in the cities of Judah: and the men of war, mighty men of valour, were in Jerusalem.
14 And these are the numbers of them according to the house of their fathers: Of Judah, the captains of thousands; Adnah the chief, and with him mighty men of valour three hundred thousand.
15 And nextc to him was Jehohanan the captain, and with him two hundred and fourscore thousand.
16 And next him was Amasiah the son of Zichri, who willingly offered himself unto the LORD; and with him two hundred thousand mighty men of valour.
17 And of Benjamin; Eliada a mighty man of valour, and with him armed men with bow and shield two hundred thousand.
18 And next him was Jehozabad, and with him an hundred and fourscore thousand ready prepared for the war.
19 These waited on the king, beside those whom the king put in the fenced cities throughout all Judah.