Paul had a special admonition for those Thessalonians who had adopted an idle lifestyle, possibly because they thought their time on earth was to be ending soon. His teaching, both by example and inspiration, is that Christians have a social and familial responsibility until the Lord comes. “If anyone will not work, neither shall he eat” (10).
So, he commanded it again here (12), as he had heard of some in the congregation who were not only idle, but their idleness was leading to sin. He called them “busybodies.”
The preparation of a Christian for eternity is seen in his obedience and positive efforts to life righteously. He is an example to the unbeliever and believer alike. Paul exhorted the Thessalonians to steadfastness, “But as for you brethren, do not grow weary in doing good” (13). This command is serious, a matter of Christian fellowship and eternal standing with God. Those who will not work are to be rejected, though our love for them is retained (15).
