The Prose Edda on Hreidmar
The Younger Edda: > Chapter Iv. > The Niflungs And Gjukungs.
attestation: Hreidmar, a mighty man skilled in black art, revealed the otter was his son; he and his sons Fafner and Regin seized and bound the asas
"Hreidmar. He was a mighty man, and thoroughly skilled in the black art. The asas asked for night-lodgings, stating that they had plenty of food, and showed the bonde their game. But when Hreidmar saw the otter he called his sons, Fafner and Regin, and said that Otter, their brother, was slain"
attestation: The ransom required filling the otter-skin (belg) with red gold and covering it completely
"Hreidmar took the otter-belg and said to them that they should fill the belg with red gold, and then cover it with the same metal, and when this was done they should be set free."
attestation: Fafner and Regin demanded shares of the ransom gold paid by Hreidmar for their slain brother, but Hreidmar refused to give them a penny
"Hreidmar accepted the gold as a ransom for his son, but Fafner and Regin demanded their share of it as a ransom for their brother. Hreidmar was, however, unwilling to give them as much as a penny of it."