Matthew Henry on 2 Chronicles 17:1-9
Here we find concerning Jehoshaphat,
I. What a wise man he was. As soon as he came to the crown he strengthened himself against Israel, Ch2 17:1. Ahab, an active warlike prince, had now been three years upon the throne of Israel, the vigour of his beginning falling in with the decay of Asa's conclusion. It is probable that the kingdom of Israel had, of late, got ground of the kingdom of Judah and began to grow formidable to it; so that the first thing Jehoshaphat had to do was to make his part good on that side, and to check the growing greatness of the king of Israel, which he did so effectually, and without bloodshed, that Ahab soon courted his alliance, so far was he from giving him any d…
Read the whole note in the consoleJamieson-Fausset-Brown on 2 Chronicles 17:4
and not after the doings of Israel--He observed with scrupulous fidelity, and employed his royal influence to support the divine institutions as enacted by Moses, abhorring that spurious and unlawful calf-worship that now formed the established religion in Israel. Being thus far removed, alike from gross idolatry and Israelitish apostasy, and adhering zealously to the requirements of the divine law, the blessing of God rested on his government. Ruling in the fear of God, and for the good of his subjects, "the Lord established the kingdom in his hand."
Adam Clarke on 2 Chronicles 17:3
The Lord was with Jehoshaphat - "The Word of the Lord was Jehoshaphat's Helper." - Targum.
John Gill on 2 Chronicles 17:4
But sought to the Lord God of his fathers,.... Prayed to him, worshipped and served him:
and walked in his commandments; observed and kept them, moral, ceremonial, and judicial:
and not after the doings of Israel: who worshipped the golden calves at Dan and Bethel.
Tyndale Open Study Notes on 2 Chronicles 17:3-4
For the first time, the Chronicler compares Judah’s practices with those of northern Israel, showing his awareness that the Baal cult from Tyre had been introduced into northern worship (see 1 Kgs 16:31-32).