The Egyptian Book of the dead by P. Le Page Renouf and Edouard Naville

3. The _Tank of Flame_. See chapter 1, note 15. The red glow of the Sky

disappears after the Sun has risen, he is therefore said to “extinguish the Flame” after he has come forth. The same notion is expressed in the myth according to which Horus strikes off the head of his mother. ------------------------------------