"Study to be quiet, and to do your own business, and to work with your own hands" (1 Thessalonians 4:11) is an admonition given by Paul in his first epistle. Note Ephesians 4:28 for a similar admonition.

Source:

KJV Defenders Study Bible, by Dr. Henry Morris, Ph.D.
Publisher: Thomas Nelson
Language: English
DEF 10 ISBN 0-529-10444-x
DEF 10-1 ISBN 0-529-10445-8