in'-stroo-ment (keli; in Greek plural hopla, Romans 6:13):

The word in the Old Testament is used for utensils for service, chiefly in connection with the sanctuary (compare Exodus 25:9; Numbers 4:12,26,32; 1 Kings 19:21; 1 Chronicles 9:29; 2 Chronicles 4:16, the King James Version); for weapons of war (1 Samuel 8:12; 1 Chronicles 12:33,17, etc.); notably for musical instruments. See MUSIC. The members of the body are described by Paul (Romans 6:13) as "instruments" to be used in the service of righteousness, as before they were in the service of unrighteousness.

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Bibliography Information
Orr, James, M.A., D.D. General Editor. "Entry for 'INSTRUMENT'". "International Standard Bible Encyclopedia". 1915.