"The Faithful Voted With Their Feet
Before the Assyrian captivity, substantial numbers from the northern tribes had identified themselves with the house of David.2
The rebellion of Jeroboam and subsequent crises caused many to repudiate the Northern Kingdom and unite with the Southern Kingdom in a common alliance to the house of David and a desire to worship the Lord in Jerusalem.3
In 930 b.c., Jeroboam ruled the Northern Kingdom from his capital in Samaria.4
When Jeroboam turned the Northern Kingdom to idolatry, the Levites (and others who desired to remain faithful) migrated south to Rehoboam.5
Horrified that Jeroboam had set up a rival religion with golden calf worship at Bethel and Dan, many Northerners moved south, knowing that the only place acceptable to God was the Temple on Mt. Moriah.6 Those who favored idolatry migrated north to Jeroboam.
Later, when Asa reigned as king in the south, another great company came from the north.7
Years after the deportation by Assyria,
King Hezekiah of Judah issued a call to all Israel to come and worship in Jerusalem and celebrate the Passover.8
Eighty years later King Josiah of Judah also issued a call, and an offering for the Temple was received from "Manasseh and Ephraim and
all the remnant of Israel...."9
Eventually, all 12 tribes were represented in the south. God even addresses the 12 tribes in the south: "Speak unto Rehoboam the son of Solomon, king of Judah, and
to all Israel in Judah and Benjamin...."10
The "tribe of Judah" (2 Kings 17:18, et al.) is used idiomatically for the Southern Kingdom.11 When encountering the tribal designations, it is important to distinguish between the territories allocated to the tribes and the people themselves..."
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link to www.khouse.org]
There are no lost tribes.