The peculiar ideas which the Egyptians held about the composition of man greatly favoured the belief in apparitions and ghosts. According to them a man consisted of a physical body, a shadow, a double, a soul, a heart, a spirit called the khu, a power, a name, and a spiritual body.
When the body died the shadow departed from it, and could only be brought back to it by the performance of a mystical ceremony; the double lived in the tomb with the body, and was there visited by the soul whose habitation was in heaven.
The soul was, from one aspect, a material thing, and like the ka, or double, was believed to partake of the funeral offerings which were brought to the tomb; one of the chief objects of sepulchral offerings of meat and drink was to keep the double in the tomb and to do away with the necessity of its wandering about outside the tomb in search of food.
It is clear from many texts that, unless the double was supplied with sufficient food, it would wander forth from the tomb and eat any kind of offal and drink any kind of dirty water which it might find in its path.
But besides the shadow, and the double, and the soul, the spirit of the deceased, which usually had its abode in heaven, was sometimes to be found in the tomb.
There is, however, good reason for stating that the immortal part of man which lived in the tomb and had its special abode in the statue of the deceased was the “double.”
This is proved by the fact that a special part of the tomb was reserved for the ka, or double, which was called the “house of the ka,” and that a priest, called the “priest of the ka,” was specially appointed to minister therein.
The double enjoyed the smell of the incense which was offered at certain times each year in the tomb, as well as the flowers, and herbs, and meat, and drink; and the statue of the deceased in which the double dwelt took pleasure in all the various scenes which were painted or sculptured on the walls of the various chambers of the tomb, and enjoyed again all the delights which his body had enjoyed upon earth.
The ka, or double, then, in very early times was, to all intents and purposes, the ghost of the Egyptians.
In later times the khu, or “spirit,” seems to have been identified with it, and there are frequent allusions in the texts to the sanctity of the offerings made to the khu, and to their territories, i.e., the districts in which their mummified bodies lie.
E.A. Wallis Budge, Egyptian Magic, London, 1901. Pp. 217-8.