Why do Christians use unleavened bread for Communion?

The use of unleavened bread in Communion is deeply symbolic, reflecting the sinless nature of Christ. In Exodus 12, the Israelites were commanded to eat unleavened bread during the Passover, representing purity and the absence of sin. Since Christ is our Passover Lamb, His body, represented by the unleavened bread, signifies His perfect and sinless sacrifice. Additionally, as the apostle Paul emphasizes in 1 Corinthians 5:6-8, a little leaven represents sin, therefore, unleavened bread serves as a poignant reminder that Jesus, being fully divine, was without sin and perfectly fulfilled the requirements of the law that we could not meet.