Jehu the prophet reproves Jehoshaphat for having allied himself with Ahab. These verses are mainly from the Chronicler, but see 1 Kings 16:1 ff.
2 Chronicles 19:4-11. This section, a kind of midrash on the name Jehoshaphat (= Yahweh judgeth), is also from the Chronicler; he imagines the judicial arrangements of his own day to have been already in existence in much earlier times. The section is, in a sense, analogous to 2 Chronicles 17:7-9.