Who are these gods?

"They are the drops of blood which came forth from the phallus of Ra when he went forth to perform his own mutilitation. These drops of blood sprang into being under the forms of the gods Hu and Sa, who are in the bodyguard of Ra, and who accompany the god Tem daily and every day. "I, Osiris the scribe Ani, whose word is truth, have filled for thee the utchat (the Eye of Ra, or of Horus), when it had suffered extinction on the day of the combat of the Two Fighters (Horus and Set)."