XVIII. Purifying the Blood by Removing Egoism through the Mystery of Golgotha, an Easter Lecture
Initiation at the ancient mystery temples continued on into the last pre-Christian centuries. We see evidence of this in the Egyptian pyramids. There the disciple who had come so far that he was able to love the whole of humanity would be put to sleep for three days. His physical body would be as if dead, in total lethargy. The initiator would be able to draw his spirit forth from him the way your spirit is drawn from your body every night when you're asleep. Just as it is true that this spirit is unconscious in ordinary sleep, so it is true that it would be conscious in disciples who had been fully prepared. The interference that comes from the physical body would no longer be there. But in those three days the disciples would be able to remember everything they had learned before; they were able to take this into their body.
Cite:
GA 96/1907-04-01_02/p035 · edition English