In Egypt the Israelites used lamb's blood to save their firstborn. The reason was that Jesus was called the "Lamb of God" because His sacrifice forgives humans' sins.
Lent in the Coptic Church of Egypt lasts for 55 days, which includes a preliminary week of modified fasting. No meat, fish, eggs or milk are supposed to be eaten during Lent. This fasting is extended as Lent goes on so that by Holy Week people are observing a stricter fast, in which they eat mainly vegetables and beans.