The command to eat unleavened bread for seven days is part of the observance of the Feast of Unleavened Bread, which follows the Passover. This feast commemorates the Israelites' exodus from Egypt, a time when they had to leave quickly and could not wait for their bread to rise. Unleavened bread, therefore, symbolizes the haste of their departure and their reliance on God's provision.
Moreover, yeast is often used in the Bible as a metaphor for sin and corruption. By removing yeast from their homes and diets, the Israelites were symbolically purifying themselves, preparing to live in obedience to God. This act of purification and remembrance was not just about physical bread but also about spiritual renewal. It was a call to reflect on their relationship with God, to remember His mighty acts of deliverance, and to commit to living according to His laws. This practice encouraged the Israelites to focus on their spiritual journey and to strive for a life that honors God.