A.T. Robertson Commentary Revelation 20:15

"And if any was not found written in the book of life, he was cast into the lake of fire." — Revelation 20:15 (ASV)

If any was not found written in the book of life (ε τις ουχ ευρεθη εν τη βιβλω της ζωης). Condition of first class with ε and the first aorist passive indicative of ευρισκω. In this short sentence the doom is told of all who are out of Christ, for they too follow the devil and the two beasts into the lake of fire (the counterpart of the Gehenna of fire, Matthew 5:22). There is no room here for soul sleeping, for an intermediate state, for a second chance, or for annihilation of the wicked. In Da 12:2 there is a resurrection to death as well as to life and so in Joh 5:29; Acts 24:15.