If I forget thee, Jerusalem…
Jews in exile in Babylon are described in Psalm 137 as stubbornly remembering the full glory of Jerusalem, explaining to their captors that they would always look towards the holy city: “May my tongue cleave to my mouth, if I ever think not of thee, if I ever prize not Jerusalem above all joys!”
To this day, in Jewish weddings, before the couple is formally married, the groom proclaims this statement before the guests and breaks a cup with his foot to symbolize sorrow for the destruction of the Temple in Jerusalem. In other words, on what is supposed to be the happiest day in the life of the couple, they stop, putting sorrow and longing for the Temple first.
This is a powerful statement about the importance of the Jerusalem with the Temple Mount at its center for keeping the Nation of Israel together as a People over the centuries.