Board Thread:Speculation House/@comment-30379057-20180522011632/@comment-36529478-20180810015358

@607208 Loki's lips were sewn shut by the dwarves as revenge for being cheated out of the right to his head, which Loki lost in a bet with them for who could provide the best gifts for the gods.

Quite a famous story, given that one of the gifts the dwarf brothers gave was Mjolnir.