Your glorying is not good. Know you not that a little leaven leavens the whole lump?
All Commentaries on 1 Corinthians 5:6 Go To 1 Corinthians 5
George Leo Haydock
AD 1849
Your glorying is not good, when you suffer such a scandal among you: you have little reason to boast of your masters, or even of the gifts and graces you received. A little leaven corrupteth the whole mass; a public scandal, when not punished, is of dangerous consequence.
Purge out the old leaven. He alludes to the precept given to the Jews of having no leaven in their houses during the seven days of the Paschal feast. For our Pasch, i.e. Paschal lamb, Christ is sacrificed: and Christians, says St. Chrysostom, must keep this feast continually, by always abstaining from the leaven of sin. (Witham)