Passage
And he gathered all Judah and Benjamin, and the strangers with them out of Ephraim and Manasseh, and out of Simeon: for they fell to him out of Israel in abundance, when they saw that the LORD his God was with him.
2 Chronicles 15:9 (KJV)
Nearby Context
2 Chronicles 15:7 Be ye strong therefore, and let not your hands be weak: for your work shall be rewarded.
2 Chronicles 15:8 And when Asa heard these words, and the prophecy of Oded the prophet, he took courage, and put away the abominable idols out of all the land of Judah and Benjamin, and out of the cities which he had taken from mount Ephraim, and renewed the altar of the LORD, that was before the porch of the LORD.
2 Chronicles 15:9 And he gathered all Judah and Benjamin, and the strangers with them out of Ephraim and Manasseh, and out of Simeon: for they fell to him out of Israel in abundance, when they saw that the LORD his God was with him.
2 Chronicles 15:10 So they gathered themselves together at Jerusalem in the third month, in the fifteenth year of the reign of Asa.
2 Chronicles 15:11 And they offered unto the LORD the same time, of the spoil which they had brought, seven hundred oxen and seven thousand sheep.
Study Lenses
The verse centers on "gathered", "judah", "benjamin", "strangers", "ephraim", "manasseh", "simeon", and "fell". It is saying that the verse draws attention to "gathered" and "judah", so its meaning should be read from those terms before moving to application.
The nearby context moves from verse 8's "And when Asa heard these words and..." into verse 10's "So they gathered themselves together at Jerusalem...", so "gathered" and "judah" belong inside that flow. In 2 Chronicles context, the local focus is covenant, worship, and faithfulness.
A plain takeaway is to answer the verse's own emphasis on "gathered" and "judah" with trust shaped by these words, not by a vague optimism outside the passage.