Isaiah is writing to exiles in Babylon describing for them what their new life in an old place will be. Water for the thirsty. Food for the hungry. God promises to make with them an everlasting covenant. And because God has done so much for them, they are to reach out to strangers, to foreign strangers.
Last week's Gospel reading described the Kingdom of Heaven. This Sunday, the lectionary pairs Isaiah 55:1-8 with the story of the amazing, abundant feeding of the hungry crowd. We could read this passage from Isaiah to help us understand what Jesus meant by the Kingdom of Heaven.