The Old Testament period was a time of preparation for the coming of Christ. The Catholic Church has always interpreted the text of the Old Testament as pointing toward Christ. The events of the Old Testament foreshadow various events from the New Testament and prefigure the teachings revealed by Christ.
The First Reading for this Sunday, taken from the Book of Wisdom, reflects on the Passover, through which the Israelites were freed from Egypt, where they had been slaves for generations. The night of the Passover, the Angel of Death flew over the land of Egypt and struck down the firstborn male in every household. The Israelites were to sacrifice a lamb and smear its blood on their doorframes, which was a signal for the angel to pass over the household and not to strike down the firstborn male. When Pharaoh saw the devastation in his domain, he decided to let the Israelites go. The captives fled, but Pharaoh decided to pursue them after all. With God's grace, Moses was able to open up the Red Sea, allowing the Israelites to walk dry-shod to the other side, but then the waters closed again when Pharaoh's army continued the pursuit, destroying them completely.
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