1 Thessalonians 3:13

to the end he may establish your hearts unblamable in holiness before our God and Father, at the coming of our Lord Jesus with all his saints.

Our God ... Paul's God was the same as the God of all the rest of the apostles and of all Christians in all generations; and the same was true of Paul's gospel. To suppose that Paul's gospel was any different from that of James or Peter is to ignore this basic truth.

Coming of our Lord Jesus ... There is not a word here of any "soon-coming" so frequently alleged as "the mistake" both of our Lord and of his holy apostles. True, some of the Thessalonians got that impression, but it was from their dull understanding, not from any statement Paul had made to that effect. If this were not the case, Paul could not have written 2Thessalonians so soon afterward for the specific purpose of correcting their false notions.

With all his saints ... It is difficult to know exactly what this means. The following summary of the difficulty is from Kelcy.[20]

The word for "holy ones" is that commonly used for all Christians in the New Testament.

On the other hand, the angels of heaven are frequently associated with Christ in the Second Advent. See Matthew 14:41,49; 25:31; Mark 8:38, etc. Of course, the angels are also called "holy."

Commentators have frequently solved the difficulty by supposing that perhaps both will be included, a view supported by 1 Thessalonians 4:14, under which passage further comment on this will be made. It is not safe, under any circumstance, to postulate any detailed description of what will take place at the Second Coming of Christ, because the glimpses afforded of that event in the New Testament are not full reports, but only glimpses, given here and there, of that glorious and terrible morning when all people will be summoned before the great white throne for their accounting before the Lord of all creation. It is an event devoutly believed as certain to occur in the future; but concerning exactly what shall take place at that time, people are doomed to a lack of full understanding until the occasion arrives, because the New Testament has left out any detailed descriptions of it.

Christ will bring "them that have fallen asleep" with him (1 Thessalonians 4:14); and his holy angels shall likewise attend the event (2 Thessalonians 1:7); and, upon the basis of these Scriptures, the view is preferable that holds "saints" in this passage as including both.