Both in the Orphic mysteries as well as in the Vedas there is a concept of the Cosmic Egg floating in the waters at the beginning of creation of life. 

As per Orphics, Phanes and as per Vedas, Hiranyagarbha or Prajapati Originated from the Cosmic egg. Who laid the egg in the first place? As per Orphics it was Chronus (God of Time) and Ananke (God of Inevitability or Fate) who laid the egg in the Oceanus and as per Vedas it was Savitr (God of Stimulator) and Vac (Goddess of Speech) who laid the egg in the Waters.

Now both these religions are very silent about one thing which they don’t mention it anywhere clearly. There was an another being who originated from the same cosmic egg before Phanes or Hiranyagarbha hatched out and it was none other than the twin of Phanes or Hiranyagarbha, The Devil (death and darkness). A truth identified by the followers of Zurvan and Zurvanism.