What is this?

"It is Ra-stau, that is to say, it is the gate to the South of Nerutef, and it is the Northern Gate of the Domain  "Now, as concerning the Island of Maati,  it is Abtu. "Others, however, say that it is the way by which Father Tem (Habakkuk 3) travelleth when he goeth forth to Sekhet-Aaru, [the place] which produceth the food and sustenance of the gods who are [in] their shrines.  "Now the Gate Tchesert is the Gate of the Pillars of Shu, that is to say, the Northern Gate of the Tuat.  "Others, however, say that the Gate of Tchesert is the two leaves of the door through which the god Tem passeth when he goeth forth to the eastern horizon of the sky.  "O ye gods who are in the presence [of Osiris], grant to me your arms, for I am the god who shall come into being among you."