Since the redemption and exodus of the Hebrews from bondage in Egypt, the people of Israel have celebrated the Passover as a memorial to God's intervention for them. For over four hundred years were the Hebrews enslaved and oppressed by the Egyptians. God came down and saw their oppression, and He remembered His covenant with Abraham, Isaac and Jacob and determined to deliver them from bondage. God raised up Moses to be the one who would lead them out of Egypt, and who would stand before Pharaoh with the decree, "Let my people go." On nine occasions, God would smite Egypt with a plague and Pharaoh would promise to let the people of Israel go, only to renege on his promise once the plague was lifted. But the tenth plague God would send upon Egypt would be the one which would break Pharaoh's spirit and force him to beg the Hebrews to leave.
At the heart of the Passover is the redemption of man from bondage through the shedding of blood. The Hebrews were saved, not because they were worthy, but because God loved them and was faithful to His covenant. This same grace of God applies to us today. Like the Hebrews, we were trapped in bondage and there was nothing we could do to save ourselves, "For by grace are ye saved through faith." (Ephesians 2:8). Like the Passover, partaking of the Lord's Supper is a memorial to be celebrated of Christians for generations to come, and is to be done "in remembrance of me," Jesus said, and to "shew the Lord's death till he come."