Matthew 26:17 The Passover took place on one night and at one meal, but the Feast of Unleavened Bread, which was celebrated with it, continued for a week. The people removed all leaven (yeast) from their homes in commemoration of their ancestors' exodus from Egypt, when they did not have time to let the bread dough rise. Thousands of people poured into Jerusalem from all over the Roman Empire for this feast.
Matthew 26:27 Each name we use for this sacrament brings out a different dimension to it. It is the "Lord's Supper" because it commemorates the Passover meal Jesus ate with His disciples; it is the "Eucharist" (thanksgiving) because in it we thank God for Christ's work in us; it is "communion" because through it we commune with God and with other believers. As we eat the bread and drink the wine, we should be quietly reflective as we recall Jesus' "death" and His promise to come again, grateful for God's wonderful gift to us, and joyful as we meet with Christ and the body of believers.
Matthew 26:28 How does Jesus' blood relate to the new covenant? People under the old covenant could approach God only through a priest and an animal sacrifice. Now all people can come directly to God through faith because Jesus' death made us acceptable in God's eyes (Romans 3:21-24). The old covenant was a shadow of the new, pointing forward to the day when Jesus Himself would be the final and ultimate sacrifice for sin. Rather than an unblemished lamb slain on the altar, the perfect Lamb of God was slain on the Cross, a sinless sacrifice so that our sins could be forgiven. All those who accept Christ receive that forgiveness.
Matthew 26:29 Again Jesus assured His disciples of victory over death and of their future with Him. The next few hours would bring apparent defeat, but soon they would experience the power of the Holy Spirit and witness the great spread of the gospel message. And one day, they would all be together again in God's new kingdom.