Hymn to Demeter
The Homeric Hymn to Demeter (7th-6th century BCE) is the founding myth of the Eleusinian Mysteries. Disguised as an old woman, Demeter drinks kykeon (barley meal, water, and mint) and later teaches the Eleusinians the 'awful mysteries.'
c. 650–550 BCE (this translation published 1914)
Ancient Text
Homer