John 18:28
Then, early in the morning they led Jesus from Caiaphas to [governor Pilate's] headquarters. But the Jewish authorities would not enter it, because [if they had] they would have become ceremonially unclean, and could not eat the Passover meal. [Note: This was because they regarded a Gentile house as defiling].
Acts 7:54
Now when the Council members heard these things they were enraged and ground their teeth at him.
1 Corinthians 5:8
So, we should observe the Festival [i.e., live the Christian life], but not with the old yeast [i.e., old sinful ways], such as the leavening [effect] of evil and wickedness, but with the unleavened bread of sincerity and truth.