The egg is an ancient symbol of new life and rebirth. In Christianity it became associated with Jesus's crucifixion and resurrection. The custom of the Easter egg originated in the early Christian community of Mesopotamia, who stained eggs red in memory of the blood of Christ, shed at his crucifixion. As such, for Christians, the Easter egg is a symbol of the empty tomb. The oldest tradition is to use dyed chicken eggs, but a modern custom is to substitute decorated chocolate, or plastic eggs filled with candy such as jellybeans; as many people give up sweets as their Lenten sacrifice, individuals enjoy them at Easter after having abstained from them during the preceding forty days of Lent.