1 Corinthians 5:7-9

Complete Jewish Bible

⁷ Get rid of the old hametz, so that you can be a new batch of dough, because in reality you are unleavened. For our Pesach lamb, the Messiah, has been sacrificed. ⁸ So let us celebrate the Seder not with leftover hametz, the hametz of wickedness and evil, but with the matzah of purity and truth.

⁹ In my earlier letter I wrote you not to associate with people who engage in sexual immorality.