The Epic of Gilgamesh
"Urshanabi, this plant is a plant against decay(?)
by which a man can attain his survival(?).
I will bring it to Uruk-Haven,
and have an old man eat the plant to test it.
The plant's name is 'The Old Man Becomes a Young Man.'
Then I will eat it and return to the condition of my youth." (11.279-291)