Your boasting [over the supposed spirituality of your church] is not good [indeed, it is vulgar and inappropriate]. Do you not know that [just] a little leaven ferments the whole batch [of dough, just as a little sin corrupts a person or an entire church]?
[About the condition of your church] your boasting is not good [indeed, it is most unseemly and entirely out of place]. Do you not know that [just] a little leaven will ferment the whole lump [of dough]?
Your ·bragging [boasting] is not good. You know the saying, “Just a little ·yeast [or leaven; C leaven is a small lump of fermented dough used to make a loaf rise, as yeast is today] makes the whole batch of dough rise [C yeast/leaven symbolizes the permeating influence of this man’s sin within the community; Gal. 5:9].”
Your pride in your church is lamentably out of place. Don’t you know how a little yeast can permeate the whole lump? Clear out every bit of the old yeast that you may be new unleavened bread! We Christians have had a Passover lamb sacrificed for us—none other than Christ himself! So let us “keep the feast” with no trace of the yeast of the old life, nor the yeast of vice and wickedness, but with the unleavened bread of unadulterated truth!
What a terrible thing it is that you are boasting about your purity and yet you let this sort of thing go on. Don’t you realize that if even one person is allowed to go on sinning, soon all will be affected?
Your flip and callous arrogance in these things bothers me. You pass it off as a small thing, but it’s anything but that. Yeast, too, is a “small thing,” but it works its way through a whole batch of bread dough pretty fast. So get rid of this “yeast.” Our true identity is flat and plain, not puffed up with the wrong kind of ingredient. The Messiah, our Passover Lamb, has already been sacrificed for the Passover meal, and we are the Unraised Bread part of the Feast. So let’s live out our part in the Feast, not as raised bread swollen with the yeast of evil, but as flat bread—simple, genuine, unpretentious.