Jehoshaphat . . . strengthened himself against Israel--The temper and proceedings of the kings of Israel rendered it necessary for him to prepare vigorous measures of defense on the northern frontier of his kingdom. These consisted in filling all the fortresses with their full complement of troops and establishing military stations in various parts of the country, as well as in the cities of Mount Ephraim, which belonged to Jehoshaphat (Ch2 15:8).
and sought not unto Baalim--a term used for idols generally in contradistinction to the Lord God of his father.
Also in the third year of his reign he sent to his princes, . . . to teach in the cities of Judah--The ordinary work of teaching devolved on the priests. But extraordinary commissioners were appointed, probably to ascertain whether the work had been done or neglected. This deputation of five princes, assisted by two priests and nine Levites, was to make a circuit of the towns in Judah. It is the first practical measure we read of as being adopted by any of the kings for the religious instruction of the people. Time and unbroken opportunities were afforded for carrying out fully this excellent plan of home education, for the kingdom enjoyed internal tranquillity as well as freedom for foreign wars. It is conformable to the pious style of the sacred historian to trace this profound peace to the "fear of the Lord having fallen on all kingdoms of the lands that were round about Judah."
the Arabians--the nomad tribes on the south of the Dead Sea, who, seeking the protection of Jehoshaphat after his conquest of Edom, paid their tribute in the way most suitable to their pastoral habits--the present of so many head of cattle.
these are the numbers--The warriors were arranged in the army according to their fathers houses. The army of Jehoshaphat, commanded by five great generals and consisting of five unequal divisions, comprised one million one hundred and sixty thousand men, without including those who garrisoned the fortresses. No monarch, since the time of Solomon, equalled Jehoshaphat in the extent of his revenue, in the strength of his fortifications, and in the number of his troops.