From Egyptian Secrets of Albertus Magnus, Joseph H. Peterson edition:
Steal the eggs of a raven, boil them hard, lay them again into the nest and the raven will fly across the sea and bring a stone from abroad and lay it over the eggs and they will become at once soft again. If such a stone is wrapped up into a bay leaf and is given to a prisoner, that prisoner will be liberated at once. Whoever touches a door with such a stone, to him that door will be opened, and he who puts that stone into his mouth will understand the song of every bird.
Timeline of related events
1725Publication of Egyptian Secrets of Albertus Magnus (lists this spell)
1869English-language translation of Egyptian Secrets (lists this spell)