Commentaries:
Jamieson, Fausset, and Brown
The oldest manuscripts read, "FOR ye are all," etc. Ye have no reason for fear, or for being taken by surprise, by the coming of the day of the Lord: "For ye are all sons (so the Greek) of light and sons of day"; a Hebrew idiom, implying that as sons resemble their fathers, so you are in character light (intellectually and morally illuminated in a spiritual point of view), Luke 16:8; John 12:36.
are not of—that is, belong not to night nor darkness. The change of person from "ye" to "we" implies this: Ye are sons of light because ye are Christians; and we, Christians, are not of night nor darkness.
Other Jamieson, Fausset, and Brown entries containing 1 Thessalonians 5:5:
Ezekiel 7:7
Luke 16:8
Romans 13:13
2 Corinthians 6:14
Ephesians 4:18
1 Thessalonians 5:3
Titus 2:11
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