1 Corinthians 5:8

(8) Old leaven—i.e., in their old state generally; and then the Apostle proceeds to particularise. Sincerity and truth are to take the place of malice and wickedness in the continuous life of the Christian. St. Chrysostom well remarks: “He said ‘Let us keep the feast’ as pointing out that the whole of time is a festival unto Christians, because of the excellence of the good things which have been given.”