Immediately following Passover (the depiction of the death of Messiah), which paved the way for personal salvation, we observe the Feast of Unleavened Bread. Prior to this Feast, which lasts for one week, we rid our homes of all leaven (yeast) products and refrain from eating leaven, which is symbolic of how Believers should live – sinless. According to the scripture, these leavened products are symbolic of sin due to yeast’s ability to “puff up” (1 Corinthians 5:6-8). This process is a physical reminder of the removal of sin from one’s life.
Paul the Apostle gives us a good clue as to how to keep this feast symbolically:
…Do you not know that a little leaven leavens the whole lump [congregation]? Therefore purge out the old leaven [old lifestyle], that you may be a new lump , since you truly are unleavened [without sin because of Messiah’s atonement you are clean – free from sin through His Blood and Word (Romans 3:25; John 15:3)]. For indeed Messiah, our Passover was sacrificed for us. Therefore let us keep the [literal] feasts [of Passover and the seven days of Unleavened Bread], not with old leaven, nor with the leaven of malice and wickedness, but with the unleavened bread of sincerity and truth (1 Corinthians 5:6-8).
The Feast of Unleavened Bread is recognized in the history of the early church in the book of Acts (12:3; 20:6).