The article deals with Hesa, the personification of a yeast mixture used for the preparation of bread dough in Ancient Egypt. He appears first in the temple of Sety I in Abydos, but further documentation cannot be found until the greco-roman period, where Hesa takes part, above all, in the processions of offering bearers in the soubassement of the temple walls. The study provides an overview of the sources and describes the characteristics of Hesa, who is principally responsible for crop growth and the rising of bread dough.