Bede

And they kept the Feast of Unleavened Bread, etc. The Apostle teaches us how we ought to keep this feast spiritually, saying: "Let us therefore feast not with the old leaven, nor with the leaven of malice and wickedness, but with the unleavened bread of sincerity and truth" (1 Cor. 5). This is to be observed for seven days; because throughout all this world's time, which runs for as many days, we ought to lead our life in sincerity and truth, indeed in the sacrifices and holocausts of all good works. …

Commentary on Ezra and Nehemiah ↗