He will not “come as a thief” to those that “watch.”
Those that watch know that he can only come on the day of trumpets, and those that always keep his feasts will already know when he will arrive, because they will be counting the 1335 days from when Antichrist appeared.
Those that were taken in by Satan’s “pre-trib rapture” may by then have taken the mark, since they will foolishly believe that they were left behind when they see the antichrist stand on the ark.
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No, He will “come as a thief” FOR those that “watch.”