The appointed time of the Feast of Unleavened Bread, which is a time of seven days that Yahweh instructed His People to eat only Unleavened bread to remember that with a strong hand He delivered them out of bondage in Egypt and the evil King, Pharaoh. We as followers of Yeshua, Our Master remember that Yahweh through His Son delivered us out of the bondage of sin and the evil one.
Also as believers we look at what Paul said this: 1 Cor 5:7-8 Purge out the old leaven, that you may be a new lump, since you truly are unleavened. For indeed Christ, our Passover, was sacrificed for us. Therefore let us keep the feast, not with old leaven, nor with the leaven of malice and wickedness, but with the unleavened bread of sincerity and truth.