As for the rest of the acts of Jehoshaphat,

2 Chronicles 20:34
As for the rest of the acts of Jehoshaphat, from beginning to end, they are indeed written in the Chronicles of Jehu son of Hanani, which are recorded in the Book of the Kings of Israel.

2 Chronicles 19:4-7
Jehoshaphat lived in Jerusalem, and once again he went out among the people from Beersheba to the hill country of Ephraim and turned them back to the LORD, the God of their fathers. / He appointed judges in the land, in each of the fortified cities of Judah. / Then he said to the judges, “Consider carefully what you do, for you are not judging for man, but for the LORD, who is with you when you render judgment. …

2 Chronicles 20:29-30
And the fear of God came upon all the kingdoms of the lands when they heard that the LORD had fought against the enemies of Israel. / Then Jehoshaphat’s kingdom was at peace, for his God had given him rest on every side.

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along with the might he exercised

2 Chronicles 17:1-2
Asa’s son Jehoshaphat reigned in his place, and he strengthened himself against Israel. / He stationed troops in every fortified city of Judah and put garrisons in the land of Judah and in the cities of Ephraim that his father Asa had captured.

2 Chronicles 17:12-13
Jehoshaphat grew stronger and stronger, and he built fortresses and store cities in Judah / and kept vast supplies in the cities of Judah. He also had warriors in Jerusalem who were mighty men of valor.

2 Chronicles 17:14-19
These are their numbers according to the houses of their fathers: From Judah, the commanders of thousands: Adnah the commander, and with him 300,000 mighty men of valor; / next to him, Jehohanan the commander, and with him 280,000; / and next to him, Amasiah son of Zichri, the volunteer for the LORD, and with him 200,000 mighty men of valor. …

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and how he waged war,

2 Chronicles 18:28-34
So the king of Israel and Jehoshaphat king of Judah went up to Ramoth-gilead. / And the king of Israel said to Jehoshaphat, “I will disguise myself and go into battle, but you wear your royal robes.” So the king of Israel disguised himself and went into battle. / Now the king of Aram had ordered his chariot commanders, “Do not fight with anyone, small or great, except the king of Israel.” …

2 Chronicles 20:22-24
The moment they began their shouts and praises, the LORD set ambushes against the men of Ammon, Moab, and Mount Seir who had come against Judah, and they were defeated. / The Ammonites and Moabites rose up against the inhabitants of Mount Seir, devoting them to destruction. And when they had finished off the inhabitants of Seir, they helped to destroy one another. / When the men of Judah came to a place overlooking the wilderness, they looked for the vast army, but there were only corpses lying on the ground; no one had escaped.

2 Chronicles 20:1-4
After this, the Moabites and Ammonites, together with some of the Meunites, came to make war against Jehoshaphat. / Then some men came and told Jehoshaphat, “A vast army is coming against you from Edom, from beyond the Sea; they are already in Hazazon-tamar” (that is, En-gedi). / Jehoshaphat was alarmed and set his face to seek the LORD. And he proclaimed a fast throughout Judah. …

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are they not written in the Book of the Chronicles of the Kings of Judah?

1 Kings 15:23-24
Now the rest of the acts of Asa, along with all his might, all his accomplishments, and the cities he built, are they not written in the Book of the Chronicles of the Kings of Judah? In his old age, however, he became diseased in his feet. / And Asa rested with his fathers and was buried with them in the city of his father David, and his son Jehoshaphat reigned in his place.

1 Kings 14:29
As for the rest of the acts of Rehoboam, along with all that he did, are they not written in the Book of the Chronicles of the Kings of Judah?

1 Kings 15:7
As for the rest of the acts of Abijam, along with all his accomplishments, are they not written in the Book of the Chronicles of the Kings of Judah? And there was war between Abijam and Jeroboam.

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2 Chronicles 17:3-6
Now the LORD was with Jehoshaphat because he walked in the earlier ways of his father David. He did not seek the Baals, / but he sought the God of his father and walked by His commandments rather than the practices of Israel. / So the LORD established the kingdom in his hand, and all Judah brought him tribute, so that he had an abundance of riches and honor. …

2 Chronicles 18:1-3
Now Jehoshaphat had an abundance of riches and honor, and he allied himself with Ahab by marriage. / And some years later he went down to visit Ahab in Samaria, where Ahab sacrificed many sheep and cattle for him and the people with him and urged him to march up to Ramoth-gilead. / Ahab king of Israel asked Jehoshaphat king of Judah, “Will you go with me against Ramoth-gilead?” And Jehoshaphat replied, “I am as you are, and my people are your people; we will join you in the war.”

2 Chronicles 19:1-3
When Jehoshaphat king of Judah had returned safely to his home in Jerusalem, / Jehu son of Hanani the seer went out to confront him and said to King Jehoshaphat, “Should you help the wicked and love those who hate the LORD? Because of this, the wrath of the LORD is upon you. / However, some good is found in you, for you have removed the Asherah poles from the land and have set your heart on seeking God.”

2 Chronicles 21:1
And Jehoshaphat rested with his fathers and was buried with them in the City of David. And his son Jehoram reigned in his place.