Commentaries:
Jamieson, Fausset, and Brown
For—enforcing the assertion that his "commandments" were "by (the authority of) the Lord Jesus" (I Thessalonians 4:2). Since "this is the will of God," let it be your will also.
fornication—not regarded as a sin at all among the heathen, and so needing the more to be denounced (Acts 15:20).
Other Jamieson, Fausset, and Brown entries containing 1 Thessalonians 4:3:
Malachi 2:10-16
Ephesians 5:17
1 Thessalonians 3:10
1 Thessalonians 4:4
Hebrews 12:14
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