2 Chronicles 18:3

And Ahab king of Israel said unto Jehoshaphat king of Judah, Wilt thou go with me to Ramoth–gilead? And he answered him, I am as thou art, and my people as thy people; and we will be with thee in the war.

Cross-references

In 2 Chronicles 19:2, Jehu rebukes Jehoshaphat for this alliance, condemning it as helping the wicked.

In 2 Chronicles 22:5, Ahaziah repeats the same mistake by allying with Israel's king at Ramoth-gilead.

1 Kings 22:4 is the parallel account of Jehoshaphat's pledge to join Ahab – identical wording and context.

Ephesians 5:11 commands no fellowship with darkness – Jehoshaphat's alliance with Ahab violates this principle.

2 Kings 3:7 Parallel

2 Kings 3:7 shows Jehoshaphat using the same pledge formula with Jehoram against Moab – repeating his earlier alliance.