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As it writes here:

Jerusalem has long been embedded into Jewish religious consciousness and Jews have always studied and personalized the struggle by King David to capture Jerusalem and his desire to build the Holy Temple there, as described in the Book of Samuel and the Book of Psalms. Many of King David's yearnings about Jerusalem have been adapted into popular prayers and songs. Jews believe that in the future the rebuilt Temple in Jerusalem will become the center of worship and instruction for all mankind and consequently Jerusalem will become the spiritual center of the world.

For a more generic overview see here