A magic spell to keep snakes away from the tombs of Egyptian kings, adopted from the Canaanites almost 5,000 years ago, could be the oldest Semitic text yet discovered, experts said Tuesday.

The phrases, interspersed throughout religious texts in Egyptian characters in the underground chambers of a pyramid south of Cairo, stumped Egyptian experts for about a century, until the Semitic connection was found.

In 2002 one of the Egyptologists e-mailed the undeciphered part of the inscription to Richard Steiner, a professor of Semitic languages at Yeshiva University in New York. Steiner discovered that the phrases are the transcription of a language used by Canaanites at some point in the period from 25th to the 30th centuries B.C.