Adam Clarke on 1 Peter 4:5

To judge the quick and the dead - They shall give account of these irregularities to Him who is prepared to judge both the Jews and the Gentiles. The Gentiles, previously to the preaching of the Gospel among them, were reckoned to be dead in trespasses and sins, Eph 2:1-5; under the sentence of death, because they had sinned. The Jews had at least, by their religious profession, a name to live; and by that profession were bound to give to God.