servants, and then the rest of the people. Moritz Markus Kalisch read to indicate that Pharaoh's servants, whom Kalisch identified with Pharaoh's magicians, had become convinced of God's unlimited power. Samson Raphael Hirsch read to indicate that Pharaoh's servants viewed the cycle of partial plagues and respites as a "trap!" Nahum Sarna noted that Aaron, not Moses, brought on the early signs and plagues. Sarna explained that Moses thus tacitly asserted his equal status with Pharaoh. Moses came to negotiate with Pharaoh as the representative of the people of Israel. Just as Pharaoh had his magicians, Moses had his assistant, Aaron. Sarna noted that in the narratives of the Ten Plagues, Aaron acted only as long as the Egyptian magicians appeared present. After their ingenuity failed them and they faded from the story, Moses acted personally to bring about the remaining plagues. Exodus chapter 12 Propp identified the protecting paschal blood of as a symbolic wound. Julius Wellhausen conceived of early Israelite religion as linked to nature's annual cycle and believed that Scripture only later connected the festivals to historical events like the Exodus from Egypt. James Kugel reported that modern scholars generally agreed that Passover reflects two originally separate holidays arising out of the annual harvest cycle. One Festival involved the sacrificing and eating of an animal from the flock, the pesa sacrifice, which arose among shepherds who sacrificed in the light of the full moon of the month that marked the vernal equinox and the end of winter (as directed in ) to bring Divine favor for a safe and prosperous summer for the rest of the flock. The shepherds slaughtered the animal at home, as the rite also stipulated that some of the animal's blood be daubed on the doorposts and lintel of the house (as directed in ) to ward off evil. The rite prescribed that no bone be broken (as directed in ) so as not to bring evil on the flock from which the sacrifice came. Scholars suggest that the name pesa derived from the verb that means "hop" (as in and 26), and theorize that the holiday may originally have involved some sort of ritual "hopping." A second Festival—the Festival of Unleavened Bread—involved farmers eating unleavened barley bread for seven days when the winter's barley crop had reached maturity and was ready for harvest. Farmers observed this Festival with a trip to a