Isaiah 28:5
In that day shall the LORD of hosts be for a crown of glory, and for a diadem of beauty, unto the residue of his people, In that day shall the LORD of hosts be for a crown of glory, and for a diadem of beauty, unto the residue of his people,
In that day is the day of future restoration when the Messiah's peaceful kingdom is established. The residue of his people are the faithful remnant who survive to that time. The Lord of hosts himself will be their glory and beauty, serving them as a crown of glory and a diadem of beauty. His coming brings the end of evil's rule and the restoration of all things. In that restored world the saved worship him, and righteousness and praise fill the nations.