Commentaries:
Robertson's Word Pictures (NT)
Sin is lawlessness (h amartia estin h anomia). The article with both subject and predicate makes them coextensive and so interchangeable. Doing sin is the converse of doing righteousness (I John 2:29). The present active participle (poiwn) means the habit of doing sin.
Other Robertson's Word Pictures (NT) entries containing 1 John 3:4:
1 John 3:7
1 John 3:9
1 John 5:6
1 John 5:17
1 John 5:18
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