The oldest temple discovered in Egypt is little more than a doorway with an altar at its threshold, and with a stele on either side of the altar. This temple is near the base of the stepped pyramid of Meydoom, dating back probably to the beginning of the fourth dynasty.[366] Later, in Egypt, as in early Babylonia, the doorway, above the threshold, had peculiar sacredness, in the temples and in the approaches to the under-world. The pylon, or propylon, of an Egyptian temple, was a monumental gateway before the temple, and exalted honor attached to it. It frequently gave its name to the entire temple.[367] The side towers of this gateway are said to have represented Isis and Nephthys, and the door itself between these towers stood for Osiris, the judge of the living and the dead.[368] There was indeed a temple in Thebes which bore the name of “Silver Threshold.” This temple “is mentioned in the time of the twenty-first dynasty; and it cannot have been earlier than the eighteenth dynasty, when silver was growing cheaper in Egypt.”[369] But the prominence of the “threshold” in the designation of the “temple” is aside from the question of the time of the use of silver. “The winged sun disk was placed above all the doors into the temples, that the image of Horus might drive away all unclean spirits from the sacred building.”[370] These overshadowing wings marked the special sacredness of the doors beneath them. When an Egyptian priest opened the door of the shrine–the holy of holies of the temple–he must prostrate himself at the threshold in reverent worship. “According to the Theban rite, ... as soon as he saw the image of the god he had to ‘kiss the ground, throw himself on his face, throw himself entirely on his face, kiss the ground with his face turned downward, offer incense,’ and then greet the god with a short petition.”[371] This priestly worship was at the threshold of the shrine. The Egyptian idea of the future life, and of the world beyond this, had marked correspondences with the Babylonian. Osiris presided over the under-world, as, indeed, he was the chief object of worship in this.[372] He had been slain in a conflict with evil, and in his new life he was the friend and helper of those who struggled against evil.[373] He was in a peculiar sense the door of the life beyond this, “Osiris, opening the ways of the two worlds;”[374] and those who passed that door safely were identified with himself in the under-world.[375]