The Pyramid Texts are a collection of ancient Egyptian religious texts from the time of the Old Kingdom. The pyramid texts are the oldest known religious texts in the world. Written in Old Egyptian, the pyramid texts were carved on the walls and sarcophagi of the pyramids at Saqqara during the 5th and 6th Dynasties of the Old Kingdom. The oldest of the texts date to between 2400-2300 BCE. Unlike the Coffin Texts and Book of the Dead into which parts of the pyramid texts later evolved, the pyramid texts were reserved only for the pharaoh and were not illustrated. Following the earlier Palermo Stone, the pyramid texts mark the next-oldest known mention of Osiris, who would become the most important deity associated with afterlife in the Ancient Egyptian religion.