Final answer:
The biblical event most closely foreshadowed by the Passover lamb is the death of Jesus Christ, who is often referred to as the 'Lamb of God'.
Step-by-step explanation:
The biblical event that is most closely foreshadowed by the Passover lamb is the death of Jesus Christ. In the Old Testament, the Passover lamb was sacrificed by the Israelites to protect them from the Angel of Death during the exodus from Egypt. Similarly, Jesus Christ, who is often referred to as the 'Lamb of God', was sacrificed on the cross to provide salvation for humanity.
This foreshadowing is seen in the typology of Christian belief, where the sacrifice of the Passover lamb mirrors the sacrifice of Jesus Christ to redeem mankind from sin. Just as the blood of the Passover lamb protected the Israelites, the blood of Jesus Christ brings forgiveness and eternal life to those who believe in him.