"When the ram's horn sounds": (lit.,) when the ram's horn "draws out" its sound, you may ascend the mountain. R. Yossi says: It is not a man's place that honors him, but he that honors his place. As long as the Shechinah was on the mountain — "Whoever touches the mountain shall be put to death." Once the Shechinah has left the mountain, all are permitted to ascend it.