The Prose Edda on Thjasse
The Younger Edda: > Chapter Ii. > Idun And Her Apples.
attestation: An eagle sitting in an oak above them claimed to be the cause of the broth not boiling
"they heard a voice in the oak above them, and he who sat there said that he was the cause that the broth did not get boiled. They looked up and saw an eagle"
attestation: The eagle immediately took both thighs and both shoulders of the ox when given permission to eat
"he flew down from the tree, seated himself beside the boiling broth, and immediately snatched up first the two thighs of the ox and then both the shoulders"
attestation: The gods lit a fire of plane-shavings at the wall; the eagle Thjasse caught fire and was slain within Asgard's gates
"the asas kindled a fire in the shavings; and the eagle, being unable to stop himself when he missed the falcon, caught fire in his feathers, so that he could not fly any farther. The asas were on hand and slew the giant Thjasse within the gates of Asgard, and that slaughter is most famous"
The Younger Edda: > Chapter Iv. > Idun.
attestation: Thjasse in eagle form met the asas and demanded a share of their food; Honer was assigned to blow the fire
"The mountain-wolf from Honer Asked for his fill From the holy table: It fell to Honer to blow the fire."
attestation: Thjasse demanded Idun, the 'sorrow-healing maid' who keeps the 'youth-preserving apples,' as ransom for releasing Loke
"Hymer's kinsman demanded That the leader of hosts The sorrow-healing maid, Who the asas' youth-preserving apples keeps, Should bring to him."