There was some debate on another question about whether there is an opinion that the Messiah has already come or not. That resulted in comments by James Read pointing out these four things that have not happened yet, presented as evidence that the Messiah has not yet come:
- Returning the exiles including the 10 lost tribes.
- Uniting the northern tribes with the tribe of Judah under one king from the house of David.
- Building the temple.
- Ruling over the world in a period of universal peace and disarmament.
So I'm looking for any mention in the Tanach of these four points, and in particular in connection with the Messiah's coming. Are these things mentioned in the Tanach in connection with the Messiah and what he has done/will do?