There are no attestations about Kvasir in the Poetic Edda.
Chapter 49-50(p.51): In the narrative of Loki's capture, Kvasir is named as the wisest of all. He is the one who deduces Loki's invention of the fishing net by examining the shape of the burnt threads in the ashes, which allows the Æsir to replicate it and catch Loki.
And when the Æsir reached the house then the first to enter was the wisest of all, called Kvasir. And when he saw in the fire the shape in the ashes where the net had burned he realized that it must be a device to catch fish, and told the Æsir.
Chapter 57-58(p.62): The primary narrative of Kvasir's origin is told. After the Æsir-Vanir War, the gods created him from their combined spittle as a symbol of their truce. He was murdered by the dwarfs Fjalar and Galar, who then created the Mead of Poetry from his blood.
Bragi replied: ‘The origin of it was that the gods had a dispute with the people called Vanir, and they appointed a peace-conference and made a truce by this procedure, that both sides went up to a vat and spat their spittle into it. But when they dispersed, the gods kept this symbol of truce and decided not to let it be wasted, and out of it made a man. His name was Kvasir, he was so wise that no one could ask him any questions to which he did not know the answer. [...] when he arrived as a guest to some dwarfs, Fialar and Galar, they called him to a private discussion with them and killed him. They poured his blood into two vats and a pot... They mixed honey with the blood and it turned into the mead whoever drinks from which becomes a poet or scholar.
Chapter 3(p.70): In a list of kennings for poetry, one of the primary ones is "Kvasir's blood."
Now examples will be given of how the poets have referred to poetry using such terms as were noted above, as when it is called Kvasir’s blood and dwarfs’ ship...
Land’s magnanimous guardian I bid hear — hear, earl, Kvasir’s blood...
Chapter 3-4(p.72): The text reiterates that the mead in the cauldron Odrerir was originally Kvasir's blood.
Poetry is called sea or liquid of the dwarfs, because the liquid in Odrerir was Kvasir’s blood before the mead was made...
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