ISB ~ 1 Corinthians 5 v13

Drive out the wicked:An expulsion formula from the Greek version of Deut 17:7 and 19:19. • Moses made legal provision in Deuteronomy to purge Israel of its most callous and reprehensible sinners. This authorized the nation to enforce the moral standards of Yahweh and so punish serious offenses. Paul extends this prerogative to the Corinthians. Here the incestuous man (1 Cor 5:1) fell under the curse of Deut 27:20.