The tenth benediction of the Amidah says:
Sound the great shofar of our freedom, raise the banner to gather our exiles and gather us together from the four corners of the earth. Blessed are you, HaShem, who gathers in the dispersed of our people Israel.
For a sermonic reflection on what all that means and what the roots of it are, go to: http://tikvatdavid.com/Sermons/Sermons.html
Interestingly, this Jewish prayer reflects certain promises of Isaiah. But Yeshua also reflected on this concept in his famous Olivet Discourse (Matthew 24). Check it out.