1 Kings 12:20

20And it happened that, when all of Israel had heard that Jeroboam had returned, gathering an assembly, they sent and called him, and they appointed him as king over all of Israel. And no one followed the house of David, except the tribe of Judah alone.
12:20 Juda only: Benjamin was a small tribe, and so intermixed with the tribe of Juda, (the very city of Jerusalem being partly in Juda, partly in Benjamin,) that they are here counted but as one tribe.(Challoner)

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