It is "the Church, which is His Body" (Ephesians 1:22-23), i.e. "the One New Man"
(Ephesians 2:14-16) - that is the "HE" that "holds fast" the full revelation of the Antichrist accompanied with "signs and lying wonders" (II Thessalonians 2:6-9)
The deliverance is promised to each believer in the Church
- regardless of whether they are "watching (awake)" or "sleeping" (I Thessalonians 5:6,9-10)