In this week’s Torah portion, our forefather Ya’akov blesses his sons, the twelve tribes. The blessing to the tribe of Yehudah, from whom Moshiach descends, is about Moshiach. Moshiach will be the king and the nations will gather to him. The Jewish People will return to the city of Jerusalem, where the Beis Hamikdash (Holy Temple) will be built.
(See Bereishis 49, 10-11; Onkelos, Rashi and more)