Happy and holy is anyone having part in the first resurrection; over these the second death has no authority, but they will be priests of God and of the Christ, and will rule as kings with him for the thousand years.”​—Rev. 20:4-6.

God is sure of them, and his judgment and discernment are perfect and infallible. He says that they are “holy,” which means they are thoroughly clean, righteous. (Rev. 20:6)