2 Chronicles 19:4
And Jehoshaphat dwelt at Jerusalem: and he went out again through the people from Beer–sheba to mount Ephraim, and brought them back unto the Lord God of their fathers.
Cross-reference
2 Chronicles 15:8-13 records Asa's reforms — removing idols and renewing covenant — directly parallel to Jehoshaphat's own reform circuit.
2 Chronicles 29:10 shows Hezekiah making a covenant to turn away wrath — similar to Jehoshaphat bringing people back to God. Both are covenant-renewing kings.
1 Samuel 7:15-17 shows Samuel traveling on a circuit as judge — paralleling Jehoshaphat's circuit from Beersheba to Mount Ephraim.
In 1 Kings 22:43, we learn Jehoshaphat did right but left high places — adding context that his revival here was incomplete.
In 1 Samuel 7:3, Samuel defines genuine return to the LORD — putting away foreign gods — the same repentance Jehoshaphat calls for here.
In 1 Samuel 7:4, Israel's response to Samuel's call mirrors the effect of Jehoshaphat's mission — they put away idols and serve the LORD only.
In 2 Kings 3:14, Elisha respects Jehoshaphat — confirming his righteous character seen in this revival work.