A.T. Robertson Commentary 1 Corinthians 5:13

"But them that are without God judgeth. Put away the wicked man from among yourselves." — 1 Corinthians 5:13 (ASV)

Put away the wicked man (εξαρατε τον πονηρον). By this quotation from De 17:7 Paul clinches the case for the expulsion of the offender (5:2). Note εξ twice and effective aorist tense.