"There is in this statement respecting the thrones, an evident allusion 
to Daniel 7:9, which speaks of thrones being “cast down,” or,more correctly rendered, “were placed,” as many able critics inform us.
These thrones were placed for the judgment work, when entered upon, as we have seen, in the second apartment of the heavenly temple of God the Father.
And when the judgment is given to the immortal saints, and they are able to enter the temple after the outpouring of the plagues (Revelation 15:8), it appears that they sit upon the thrones thus placed for them, and with the Savior at their head finish the work of the judgment as indicated in the text examined.
---They are, in this exalted state, priests to God and Christ, not as mediators with them in behalf of wicked men, but as worshipers of God and the Lamb, even as Christians in their mortal state are a royal priesthood to offer up spiritual sacrifices acceptable to God, by Jesus Christ. 1 Peter 2:5,9.
The reason why so vast a period as 1,000 years intervenes between the resurrection of the righteous and the resurrection of the wicked, is now made very apparent. The work committed to the saints demands no less a period than that assigned it by the Holy Scriptures. It is that they examine the books of God’s records to determine the measure of guilt of each wicked man, and of every fallen angel.
--- To this great exaltation the psalmist refers in these words:- “For the Lord takes pleasure in his people; he will beautify the meek with salvation. Let the saints be joyful in glory;
let them sing aloud upon their beds.
Let the high praises of God be in their mouth, and a two-edged sword in their hand; to execute vengeance upon the heathen, and punishments upon the people; to bind their kings with chains, and their nobles with fetters of iron; to execute upon them the judgment written; this honor have all his saints. Praise you the Lord.” Psalm 149:4-9.
---The saints have no participation in the work of the judgment until the coming of the Lord. 1 Corinthians 4:5.
---The decision of every case is made by God the Father before he sends his Son to execute the judgment. Daniel 7:9-14, compared with Jude 14, 15.
---It is the execution of the judgment, therefore, that pertains to the Son. John 5:22,27." J.N. Andrews