John Gill Commentary Psalms 122:5

"For there are set thrones for judgment, The thrones of the house of David." — Psalms 122:5 (ASV)

For there are set thrones of judgment
In Jerusalem as the Targum; here were courts of judicature, and thrones for the judges to sit upon, to execute judgment and justice to the people;

the thrones of the house of David ;
the Targum is, ``thrones in the house of the sanctuary, for the kings of the house of David;'' who might sit there, as the Jews say, when others might not.

In the church of Christ, the heavenly Jerusalem, every saint is a king, as well as a priest, and all have thrones and seats there; have a power of judging, not only lesser matters pertaining to this life, but such as regard the spiritual peace and welfare of the church and interest of Christ; having laws and rules given them to go by, in the admission and exclusion of members, and respecting their conduct to each other, and to their Lord and head: and in the New Jerusalem there will be thrones set, not only for the twelve apostles of Christ, and for the martyrs of Jesus, but for all the saints; there will be the thrones of God and of the Lamb, and every overcomer shall sit down on the same; this honour will have all the saints, (Matthew 19:28) (Revelation 20:4) (22:3) (3:21) .