In any event, John is on Patmos, where
he has his first vision, of Christ himself. John indicates this happened while
he was “in the Spirit” on “the Lord’s Day” (1:10). This is the first time in
Christian literature that Sunday is called the Lord’s day—named that because it
is the day the Lord was raised from the dead. Being in the Spirit may indicate
that he was deep in prayer or had even gone into a kind of trance. (Bart D.
Ehrman, Armageddon: What the Bible Really Says about the End [New York:
Simon & Schuster, 2023], 29-30)