Psalms 87 focuses on the significance of Jerusalem, highlighting its status as the city founded by the Lord and his great love for it. The text speaks of various nations, including Egypt, Babylon, Philistia, Tyre, and Ethiopia, becoming citizens of Jerusalem, emphasizing the city's importance as a place where everyone enjoys the rights of citizenship. Ultimately, the passage conveys a message of joy and belonging centered around Jerusalem, depicted as the source of life for those who reside there.