We have seen the problem and the prescription. Today Paul explains why the church cannot simply wait it out. Verses 6 through 8:

“Stop being proud! Dont you know how a little yeast can spread through the whole batch of dough? Get rid of the old yeast! Then you will be like fresh bread made without yeast, and that is what you are. Our Passover lamb is Christ, who has already been sacrificed. So dont celebrate the festival by being evil and sinful, which is like serving bread made with yeast. Be pure and truthful and celebrate by using bread made without yeast.” (1 Corinthians 5:6–8, CEV)