This is not as simple as it might seem. Most Christian will tell you it was to save people. That is just a by product! The Real answer lies in the new covenant which is first mentioned in Deuteronomy 20:1 "These [are] the words of the covenant, which YHVH commanded Moses to make with the children of Israel in the land of Moab, beside the covenant which he made with them in Horeb."
Then again in Jeremiah 31:31 "Behold, the days come, saith YHVH, that I will make a new covenant with the house of Israel, and with the house of Judah".
Repeated again in Hebrews 8:8 "For finding fault with them, he saith, Behold, the days come, saith the Lord, when I will make a new covenant with the house of Israel and with the house of Judah:"
This is the right of return...made possible by Yeshua's Blood!
"And to Yeshua the mediator of the new covenant, and to the blood of sprinkling, that speaketh better things than [that of] Abel." Hebrews 12:24
"Wherefore we receiving a kingdom which cannot be moved, let us have grace, whereby we may serve YHVH acceptably with reverence and awe: for our Elohom is a [is] a consuming fire." Hebrews 12:28-29
The Kindom of course is all of Israel.
Yah's Blessings and Shalom!