In the Theban Recension of the Book of the Dead is found a Chapter (No. clvi.) which was composed for the purpose of bestowing upon the deceased some of the magical power of the goddess Isis. The Chapter was intended to be recited over an amulet called thet, made of carnelian, which had to be steeped in water of ankhami flowers, and set in a sycamore plinth, and if this were laid on the neck of a dead person it would place him under the protection of the words of power of Isis, and he would be able to go wheresoever he pleased in the Underworld.
The words of the Chapter were:
"Let the blood of Isis, and the magical powers (or spirits) of Isis, and the words of power of Isis, be mighty to protect and keep safely this great god (i.e., the deceased), and to guard him from him that would do unto him anything which he abominateth."
Isis and Words of Power:
From a number of passages in the texts of various periods we learn that Isis possessed great skill in the working of magic, and several examples of the manner in which she employed it are well known.
Thus when she wished to make Ra reveal to her his greatest and most secret name, she made a venomous reptile out of dust mixed with the spittle of the god, and by uttering over it certain words of power she made it to bite Ra as he passed. When she had succeeded in obtaining from the god his most hidden name, which he only revealed because he was on the point of death, she uttered words which had the effect of driving the poison out of his limbs, and Ra recovered.
Now Isis not only used the words of power, but she also had knowledge of the way in which to pronounce them so that the beings or things to which they were addressed would be compelled to listen to them and, having listened, would be obliged to fulfill her bequests. The Egyptians believed that if the best effect was to be produced by words of power they must be uttered in a certain tone of voice, and at a certain rate, and at a certain time of the day or night, with appropriate gestures or ceremonies.
In the Hymn to Osiris it is said that Isis was well skilled in the use of words of power, and it was by means of these that she restored her husband to life, and obtained from him an heir. It is not known what the words were which she uttered on this occasion, but she appears to have obtained them from Thoth, the "lord of divine words," and it was to him that she appealed for help to restore Horus to life after he had been stung to death by a scorpion.
From G:ods of the Egyptians (1904)