1 Corinthians 5:8

8 Therefore, let us celebrate the festival, not with the old yeast, the yeast of malice and evil, but with the unleavened bread of sincerity and truth.

1 Corinthians 5:8 In-Context

6 Your boasting is not a good thing. Do you not know that a little yeast leavens the whole batch of dough?
7 Clean out the old yeast so that you may be a new batch, as you really are unleavened. For our paschal lamb, Christ, has been sacrificed.
8 Therefore, let us celebrate the festival, not with the old yeast, the yeast of malice and evil, but with the unleavened bread of sincerity and truth.
9 I wrote to you in my letter not to associate with sexually immoral persons—
10 not at all meaning the immoral of this world, or the greedy and robbers, or idolaters, since you would then need to go out of the world.
New Revised Standard Version Bible, copyright 1989, Division of Christian Education of the National Council of the Churches of Christ in the United States of America. Used by permission. All rights reserved.