Ezekiel prophesied about how the sheep of Israel would be scattered.
Ezekiel 34: 6 My sheep wandered through all the mountains, and upon every high hill: yea, my flock was scattered upon all the face of the earth, and none did search or seek after them.
Then he says David will be bring them together and be shepherd over them all.
23 And I will set up one shepherd over them, and he shall feed them, even my servant David; he shall feed them, and he shall be their shepherd.
24 And I the Lord will be their God, and my servant David a prince among them; I the Lord have spoken it.
25 And I will make with them a covenant of peace, and will cause the evil beasts to cease out of the land: and they shall dwell safely in the wilderness, and sleep in the woods.
26 And I will make them and the places round about my hill a blessing; and I will cause the shower to come down in his season; there shall be showers of blessing.
27 And the tree of the field shall yield her fruit, and the earth shall yield her increase, and they shall be safe in their land, and shall know that I am the Lord, when I have broken the bands of their yoke, and delivered them out of the hand of those that served themselves of them.
That seems to agree with Revelation where the 144,000 of Israel are all redeemed; and I see the Gentiles in the multitude before the throne (of every nation and so on, also redeemed.
Revelation 7:9 After this I beheld, and, lo, a great multitude, which no man could number, of all nations, and kindreds, and people, and tongues, stood before the throne, and before the Lamb, clothed with white robes, and palms in their hands;
I wondered once how many trees there were in Eden. An idea came to mind, seventy -- for the seventy nations. Could that be right? If so, I figured maybe someone before me thought so. I found someone who said seventy and then said the seventy palm trees at Elim meant that too.
Exodus 15:27 And they came to Elim, where were twelve wells of water, and threescore and ten palm trees: and they encamped there by the waters.
I see twelve tribes of Israel and seventy nations. Israel was to "water" the nations -- not with water that comes down, but with water that comes up from the earth. The Sanhedrin also had seventy members to show that Israel was supposed to intercede for the nations. The four tassels on their prayer shawls were meant to pray for all people to the four corners of the earth. The four horns on their altar meant the same.
God knows who the real Israel is and where.
Amos 9:9 For, lo, I will command, and I will sift the house of Israel among all nations, like as corn is sifted in a sieve, yet shall not the least grain fall upon the earth.
Those who are truly Israel cannot be lost. Thus Paul says all Israel (the true Israel) will be saved. They can be lopped off the Tree of Life, but they will be grafted back on. The way I see it, the Jews cannot find rest until their job is done -- helping redeem the Gentiles. Then they enter together.