In Greek mythology, Zeus sent Hermes to give Pandora her final gift: a deceptive tongue.
Hesiod’s Theogony describes Pandora’s creation as part of Zeus’s punishment of humanity after Prometheus’s theft of fire. Different gods contribute qualities to her making. Hermes gives her a mind with a dog’s character and a deceptive nature, while the gods’ gifts collectively make her “all-gifted.”
The detail is sometimes simplified into the claim that Hermes merely gives Pandora speech. Hesiod’s wording emphasizes deceit and character, not just the physical ability to talk. The episode therefore presents language as one element in a wider construction of Pandora’s dangerous charm.
Zeus is the organizer of the punishment, but Hermes is the deity associated with the particular gift in this question. Aphrodite and Athena also appear in later retellings as contributors to Pandora’s appearance or skills, which can create confusion about who gives what.