The Bible has over 160 instances in the same verse, where Israel and Judah are mentioned together as different entities. It’s clear that they are not to be rejoined until after the Middle East is cleared and His people are regathered, judged and settled together in the Land, Greater Israel.
Mainstream Church teaching, especially Catholic, says that the Jews now in the Land are all Israel. Some teach Replacement theology, where their Church is now the new Israel.
Have they rejoined already? Josephus, the Jewish historian, circa 100AD, wrote that the 10 lost tribes were a great multitude, then living beyond the Euphrates River.
In the Talmud, Rabbi’s Akiva and Eliezer circa 200AD, discuss the question of when the 10 lost tribes would return. So, only Judah was present at that time.
At the establishment of the State of Israel, in 1948, the name was to have been Judah, but David Ben Gurion changed to Israel at the last minute.
So, we await the fulfilment of these prophecies;
Ezekiel 37:21-22 I am going to take the Israelites [the 2 tribes of Judah and the 10 tribes of Israel.] from their places of exile among the nations. I shall assemble them from every quarter and restore them to their own soil. I shall make them a single nation in the Land and one King will be over them all. No longer will they be two nations or divided into two Kingdoms.
Jeremiah 50:4-5 In those days and at that time [ after the land has been cleansed] The people of Israel and the people of Judah will come together and in tears go in search of their God. They will ask the way to Zion, turning towards her and saying; Come, let us join ourselves to the Lord in everlasting covenant.
Hosea 1:11 The people of Judah and Israel will be reunited and will choose for themselves one leader. [has to be before the Return of Jesus]
Micah 7:8-10 My enemies, do not exult over me [ Israel] Though I have fallen, I will rise again. Though I sit in darkness, the Lord will be my light. Because I have sinned against the Lord I must bear His anger until He pleads my case, gives judgement and establishes my rights. Then my enemies will see it and be shamed – those who said “where is your God “. I will see their downfall, they will be trampled like mud on the streets.
Micah 7:11-12 The day for rebuilding and extending your boundaries will come. A day when Your people will return to the Land, from every sea and every mountain.
Zechariah 1:18-21 The four horns [ nations, peoples.] that scattered Judah and Israel.
Assyria, Babylon, Rome and now Islam.
The four smiths [destroyers] have come to overthrow them.
Hosea 2:23 Israel will be My new sowing in the Land, I will love them and say to them,
“You are My people” and they will say “You are our God”. Romans 9:24-26
Ref, REB, NIV, KJV.