Religious beliefs

The concept of the "Ten Lost Tribes" originally began in a religious context, based on Biblical sources, not as an ethnological idea. Some scientists have researched the topic, and at various times some have made claims of empirical evidence of the Ten Lost Tribes. However, religious and scriptural sources remain the main sources of the belief that the Ten Lost Tribes have some continuing, though hidden, identity somewhere.
There are numerous references in Biblical writings. In Ezekiel 37:16-17, the prophet is told to write on one staff (quoted here in part) "For Judah..." and on the other (quoted here in part) , "For Joseph..." (the main Lost Tribe). The prophet is then told that these two groups shall be someday reunited.
Moreover, thou son of man, take thee one stick, and write upon it, For Judah, and for the children of Israel his companions: then take another stick, and write upon it, For Joseph, the stick of Ephraim, and for all the house of Israel his companions: And join them one to another into one stick; and they shall become one in thine hand. Ezekiel 37:16-17 KJV
There are also discussions in the Talmud as to whether the Ten Lost Tribes will eventually be reunited with the Tribe of Judah, that is, with the Jewish people.