The Son's throne represents his rule. Alternate translation: "You are God, and your reign will last forever and ever" (See: [[rc://en/ta/man/translate/figs-metonymy]])
Here "scepter" refers to the Son's rule. Alternate translation: "And you will rule over the people of your kingdom justly" (See: [[rc://en/ta/man/translate/figs-metonymy]])