2 Chronicles 25:21

Overview - 2 Chronicles 25
Amaziah begins to reign well.
He executes justice on the traitors.
Having hired an army of Israelites against the Edomites, at the word of a prophet dismisses them.
11 He overthrows the Edomites.
13 The Israelites, discontented with their dismission, spoil as they return home.
14 Amaziah, proud of his victory, serves the gods of Edom, and despises the admonitions of the prophet.
17 He provokes Joash to his overthrow.
25 His reign.
27 He is slain by conspiracy.
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2 Chronicles 25:21  (King James Version)
So Joash the king of Israel went up; and they saw one another in the face, both he and Amaziah king of Judah, at Bethshemesh, which belongeth to Judah.

they saw one another
That is, "they fought against each other." To face an enemy, or to face one another, is still a common expression. The reason of this war was evidently the injury the army of Joash had done to the unoffending inhabitants of Judah. The ravages committed by them were totally unprovoked, base, and cowardly: they fell upon women, old men, and children, and butchered them in cold blood, when all the effective men were gone with their king against the Edomites. The quarrel of Amaziah were certainly just, yet he was put to the rout: he fell, and Judah with him, as Joash had said; and the reason was, because "it came of God, that he might deliver them into the hands of
their enemies, because they sought after the gods of Edom." This was the reason why the Israelites triumphed. 17

Joshua 21:16 ; 1 Samuel 6:9 1 Samuel 6:19 1 Samuel 6:20