What about
Isaiah 11:11
In that day the Lord will reach out his hand a second time to reclaim the surviving remnant of his people from Assyria, from Lower Egypt, from Upper Egypt, from Cush, from Elam, from Babylonia, from Hamath and from the islands of the Mediterranean.
11 And it shall come to pass in that day, that the Lord shall set his hand again the second time to recover the remnant of his people, which shall be left, from Assyria, and from Egypt, and from Pathros, and from Cush, and from Elam, and from Shinar, and from Hamath, and from the islands of the sea.
Isaiah 11:11 says “in that day.” That could be interpreted to mean any number of things, the Day of the Lord, the last days, or during the Messianic Era, or it could mean all three.
It says: “the Lord will reach out his hand.” It is obvious to me that is metaphorical because God does not have hands. What that means to me is that according to God’s Will, God will cause this to happen.
It says God will
reclaim the surviving remnant of His people in Assyria, from Lower Egypt, from Upper Egypt, from Cush, from Elam, from Babylonia, from Hamath and from the islands of the Mediterranean.
What does it mean to reclaim something?
transitive verb. 1a : to recall from wrong or improper conduct : reform. b : tame, subdue. 2a : to rescue from an undesirable state also : to restore to a previous natural state reclaim mining sites.
Reclaim | Definition of Reclaim by Merriam-Webster
Within this context, what
reclaim means to me is that God will come back and get (rescue) those people that were in an undesirable state and restore them to their previous state.
12 He will raise a banner for the nations and gather the exiles of Israel; he will assemble the scattered people of Judah from the four quarters of the earth.'
12 And he shall set up an ensign for the nations, and shall assemble the outcasts of Israel, and gather together the dispersed of Judah from the four corners of the earth.
To me Isaiah 11:12 means God will bring back the Jews who had been exiled to their homeland (Israel), and these Jews who will be brought back will come from the all over the world (from the four quarters of the earth), and they will be assembled (gathered together) in Israel.
Please note that
the verse does not say that ALL the Jews in the world who had been exiled will be brought back to Israel.
It says that Jews will come from ALL over the world and they will be assembled in Israel.
What of this word 'remnant' mean to you?
Remnant: (Entry 1 of 2) 1a : a usually small part, member, or trace remaining. b : a small surviving group —often used in plural. 2 : an unsold or unused end of piece goods.
Remnant | Definition of Remnant by Merriam-Webster
What does remnant mean in the Bible?
The remnant is a recurring theme throughout the Hebrew and Christian Bible. The Anchor Bible Dictionary describes it as "What is left of a community after it undergoes a catastrophe". The concept has stronger representation in the Hebrew Bible and Christian Old Testament than in the Christian New Testament.
Remnant (Bible) - Wikipedia
Within this context,
remnant means what is left of God’s people, the small surviving group.
Have the remnant of Jews been removed from Assyria, Egypt, the Mediterranean Islands?
Did it occur during the life of Baha'u'llah?
I do not know if the remnant of Jews been removed from Assyria, Egypt, the Mediterranean Islands, but the verse does not say they would be removed, it says they would be recovered.
11 And it shall come to pass in that day, that the Lord shall set his hand again the second time to recover the remnant of his people, which shall be left, from Assyria, and from Egypt, and from Pathros, and from Cush, and from Elam, and from Shinar, and from Hamath, and from the islands of the sea.
These words have different meanings. Remove means take (something) away or off from the position occupied whereas recover means to bring back to normal position or condition.
Even if it was interpreted to mean the remnant of Jews in these places would be recovered and then move back to Israel that does not mean that
the entire remnant of Jews (every single Jew) living in those places would move back to Israel.
I do not know how many Jews returned to Israel during the lifetime of Baha’u’llah, but according to this article
'Gathering of the Exiles': After Thousands of Years, Jews Come Home to Israel, nearly 70 years before the rebirth of the modern State of Israel, the Jewish people began to return to their ancient homeland, as the prophets foretold. Since the modern state of Israel was established in 1948, that would mean that the Jews started coming back in 1878, which was during the lifetime of Baha’u’llah.