For what is our hope, or joy, or crown of rejoicing? Isn't it even you, before our Lord Jesus{TR adds "Christ"} at his coming?
"Parousia ["coming"] comes from two words: ’to be’ and ’present.’ It may point to the moment of arrival to initiate a visit or it may focus on the stay initiated by the arrival. In the NT the word applies to the return of Jesus Christ. The various facets of this future visit are defined by the contexts in which parousia appears. In this instance it is Jesus’ examination of his servants subsequent to his coming for them (1 Thessalonians 4:15-17) that is in view." [Note: Thomas, p. 262.] 