The Song of Moshe (Moses) indicates that 10-Israel would ultimately be forgotten to history because they neglected and forgot the Rock, the El, that delivered and preserved them in former times.
Deuteronomy 32:26 "I have said: I blow them away, I cause their remembrance to cease from man;"
During a conversation with Moshe, יהוה gets angry with Israel and threatens to blot out their name from history, but then decides against it.
Deuteronomy 9:24 "Let Me alone, that I may destroy them and blot out their name from under heaven; and I will make of you a nation mightier and greater than they.'"
Many hundreds of years later, the patience of יהוה runs out and He accomplishes the threats mentioned to Moshe previously. He allowed the Assyrians to bring a devastating end to the Northern Kingdom of Israel and over the next 2700 years, the 10 Tribes of Israel become commonly known as "the Lost 10 Tribes of Israel". Yet, even though the Prophet Hosea indicates the Northern Kingdom would cease to be "a people", they are promised to become a great multitude and promised to be remembered again as "the People of El" in the Latter (Last) Days. Read it for yourself:
(9)And יהוה said, "Name him Lo-ammi, for you are not My people and I am not your El."
(10)Yet the number of the sons of Israel will be like the sand of the sea, which cannot be measured or numbered; And in the place where it is said to them, "You are not My people," it will be said to them, "You are the sons of the living El."
(11)And the sons of Judah and the sons of Israel will be gathered together, and they will appoint for themselves one leader, and they will go up from the land, for great will be the day of Jezreel."
Hosea 2:23 "I will sow her for Myself in the land, and I will also have compassion on her who had not obtained compassion,
And I will say to those who were not My people, 'You are My people!' and they will say, 'You are my El!'"
Apparently Messiah Yeshua (Jesus) also considered 10-Israel to be "lost" at the beginning of the First Century CE:
Matthew 15:24 But He answered and said, "I was sent only to the lost sheep of the House of Israel."
Mark 10:5-6 These twelve Yeshua sent out after instructing them: "Do not go in the way of the gentiles, and do not enter any city of the Samaritans; (6) but rather go to the lost sheep of the House of Israel."
Most Christians who read the above verses perceive this "lost" state as something just figurative or spiritual, without considering the possibility that the House of 10-Israel was both spiritually and physically "lost". Those ignorant of the Two House reality of course think of just the Jews (the Southern Kingdom of Jew-dah). Yet, an interesting study is this: To what regions or peoples did the Disciples of Yeshua go to in the years following his death and resurrection? They followed his orders and went to lands inhabited by the scattered and lost sheep of 10-Tribe Israel. Yet this begs the question: How could 10-Israel be "lost" if the disciples knew where to go to find them? One could argue they knew the general directions or general peoples of scattered Israel. They were certainly not "lost" to the Great Shepherd, Messiah Yeshua, but most of their populations likely did become lost to themselves. The disciples were the fishermen prophesied in Jeremiah 16:16 and Yeshua said he was going to "make them fishers of men" (Matthew 4:19).
- Andrew, brother of Peter, went to Scythia.
- Peter went to Egypt and Persia.
- Bartholomew went to greater Armenia (modern Armenia, eastern Turkey, northern Iraq, northwestern Iran) and India.
- Thomas went to Parthia (including the regions of Afghanistan, Iran, and Iraq) and even south India.
- Jude went to Persia.
Note: as shown by the Prophet Hosea earlier, "the peoples" of the dispersal aren't to be remembered as "Israelite" or "the People of El", but Flavius Josephus indicated they dwelt in the regions of Scythia, Saka-India, Media, Persia, Parthia, etc... regions apparently known to the disciples. For more details and references, see “Fate of the Apostles” on the Christian Classics Ethereal Library website.