Greg looks at the significance of Palm Sunday, emphasizing its connection to Old Testament prophecies and rituals, particularly focusing on the Day of Atonement outlined in Leviticus. He discusses the intricate details of the sacrifices and rituals mandated during the Day of Atonement, highlighting its critical role in Jewish religious practice. Drawing parallels between Old Testament practices and the events of Palm Sunday, Greg connects Jesus' triumphal entry into Jerusalem with themes of atonement and fulfillment of prophecy. Jesus' actions during the triumphal entry, such as riding on a donkey and being hailed as king, are interpreted in light of Old Testament symbolism. The speaker ultimately emphasizes the profound theological significance of Jesus' sacrifice, framing it as the culmination of Old Testament foreshadowing and the establishment of a new covenant relationship between God and humanity.