Taylor, Easter "focuses upon the consummation of the redemptive act of God in the death/resurrection of Jesus Christ." Easter is linked to the Passover and Exodus from Egypt recorded in the Old Testament through the Last Supper and crucifixion that preceded the resurrection. According to the New Testament, Jesus gave the Passover meal a new meaning, as he prepared himself and his disciples for his death in the upper room during the Last Supper. He identified the loaf of bread and cup of wine as his body soon to be sacrificed and his blood soon to be shed. 1 Corinthians 5:7 states, "Get rid of the old yeast that you may be a new batch without yeastas you really are. For Christ, our Passover lamb, has been sacrificed"; this refers to the Passover requirement to have no yeast in the house and to the allegory of Jesus as the Paschal lamb. The Jewish feast of First-fruits is regarded by dispensationalists as foreshadowing its fulfilment in the resurrection of Jesus based on 1 Corinthians 15:20 "But Christ has indeed been raised from the dead, the firstfruits of those who have fallen asleep." In Christian art In the Catacombs of Rome, artists indirectly hinted at the resurrection by using images from the Old Testament such as the fiery furnace and Daniel in the Lion's den. Depictions prior to the 7th century generally showed secondary events such as the Myrrhbearers at the tomb of Jesus to convey the concept of the resurrection. An early symbol of the resurrection was the wreathed Chi Rho (Greek letters representing the word "Khristos" or "Christ"), whose origin traces to the victory of emperor Constantine I at the Battle of the Milvian Bridge in 312, which he attributed to the use of a cross on the shields of his soldiers. Constantine used the Chi Rho on his standard and his coins showed a labarum with the Chi Rho killing a serpent. The use of a wreath around the Chi Rho symbolizes the victory of the resurrection over death, and is an early visual representation of the connection between the Crucifixion of Jesus and his triumphal resurrection, as seen in the 4th-century sarcophagus of Domitilla in Rome. Here, in the wreathed Chi Rho the death and Resurrection of Christ are shown as inseparable, and the Resurrection is not merely a happy ending tucked at the end of the life