It is not good for you to glory. Do you not know that a little leaven corrupts the entire mass
Other versions
King James Version
Your glorying is not good. Know ye not that a little leaven leaveneth the whole lump?English Standard Version
Your boasting is not good. Do you not know that a little leaven leavens the whole lump?New International Version
Your boasting is not good. Don't you know that a little yeast works through the whole batch of dough?