Bede — on Rev 20:6 (Commentary on Revelation)

“But they shall be priests of God and of Christ. Another version reads, Priests of God and of Christ. However, this is not said only of bishops and priests, who are properly called priests in the Church, but just as we are all called Christians because of the mystical chrism, so we are all called priests because we are members of the one Priest. As the apostle Peter says: You are a chosen race, a royal priesthood, a holy nation (1 Pet. 2).”