approximately in which year or in which century was this work written in?
It reached its basic form in or before the 24th century BCE.
Osiris myth
 basic form in or before the 24th century BCE.
what is osiris myth? It is the most elaborate and influential story in ancient Egyptian mythology. can you tell me what is this story all about in a short sentence? It concerns the murder of the god Osiris, a primeval king of Egypt, and its consequences.
wiki:11547285
Osiris myth [SEP] Introduction
The myth, with its complex symbolism, is integral to ancient Egyptian conceptions of kingship and succession, conflict between order and disorder, and especially death and the afterlife. It also expresses the essential character of each of the four deities at its center, and many elements of their worship in ancient Egyptian religion were derived from the myth. The Osiris myth reached its basic form in or before the 24th century BCE. Many of its elements originated in religious ideas, but the struggle between Horus and Set may have been partly inspired by a regional conflict in Egypt's Early Dynastic or Prehistoric Egypt.