Is the theory of the ten lost tribes of Israel true?
No, the theory is not true. Scripture identifies the dry bones as the whole house of Israel, not merely Judah and Benjamin. The idea that the other ten tribes are lost, destroyed, and no longer viable flies in the face of Scripture, which depicts all Israel returning from the nations.
Les explains that Ezekiel's vision of the valley of dry bones is not merely symbolic but depicts the nation of Israel coming back to their homeland out of all the nations of the earth. In verse 11, God tells Ezekiel, "these bones are the whole house of Israel." Les emphasizes this because a great move maintains that today's Jews are only the residue of Judah and Benjamin, and the other ten tribes have been lost, destroyed, and are no longer a viable entity. He says that flies in the face of Scripture, since the vision includes the whole house of Israel, not just two tribes.
Then he said unto me, Son of man, these bones are the whole house of Israel: behold, they say, Our bones are dried, and our hope is lost: we are cut off for our parts.