The tenth plague in Egypt was the one that finally made Pharaoh let the Israelites go, but it was also pointing towards Jesus' coming.
Key Verse:
For when Pharaoh stubbornly refused to let us go, the Lord killed all the firstborn in the land of Egypt, both the firstborn of man and the firstborn of animals. Therefore I sacrifice to the Lord all the males that first open the womb, but all the firstborn of my sons I redeem.'
Exodus 13:15
