Which ancient Greek poem contains Hesiod’s account of Pandora opening the jar?

Hesiod’s account of Pandora opening the jar appears in Works and Days.

Works and Days is a didactic poem concerned with farming, justice, labor, and the difficult conditions of human life. The Pandora episode appears within its explanation of why suffering and toil affect humanity. The poem connects the story to Zeus’s punishment after Prometheus gives fire to humans.

Hesiod also wrote the Theogony, a poem about the origins and genealogy of the gods. Because both works come from the same poet and overlap in mythic material, readers sometimes assign the Pandora story to the wrong poem. The detailed jar episode belongs to Works and Days.

The poem is generally dated to the early archaic period of Greek literature, often around the seventh century BCE. Its surviving text is one of the earliest literary sources for the Pandora tradition.