Utgard-Loke now asked Thor what feats there were that he would be willing to exhibit before them, corresponding to the tales that men tell of his great works. Thor replied that he preferred to compete with someone in drinking. Utgard-Loke said there would be no objection to this. He went into the hall, called his cup-bearer, and requested him to take the sconce-horn that his thanes were wont to drink from. The cup-bearer immediately brought forward the horn and handed it to Thor. Said Utgard-Loke: From this horn it is thought to be well drunk if it is emptied in one draught, some men empty it in two draughts, but there is no drinker so wretched that he cannot exhaust it in three. Thor looked at the horn and did not think it was very large, though it seemed pretty long, but he was very thirsty. He put it to his lips and swallowed with all his might, thinking that he should not have to bend over the horn a second time. But when his breath gave out, and he looked into the horn to see how it had gone with his drinking, it seemed to him difficult to determine whether there was less in it than before. Then said Utgard-Loke: That is well drunk, still it is not very much. I could never have believed it, if anyone had told me, that Asa-Thor could not drink more, but I know you will be able to empty it in a second draught. Thor did not answer, but set the horn to his lips, thinking that he would now take a larger draught. He drank as long as he could and drank deep, as he was wont, but still he could not make the tip of the horn come up as much as he would like. And when he set the horn away and looked into it, it seemed to him that he had drunk less than the first time; but the horn could now be borne without spilling. Then said Utgard-Loke: How now, Thor! Are you not leaving more for the third draught than befits your skill? It seems to me that if you are to empty the horn with the third draught, then this will be the greatest. You will not be deemed so great a man here among us as the asas call you, if you do not distinguish yourself more in other feats than you seem to me to have done in this. Then Thor became wroth, set the horn to his mouth and drank with all his might and kept on as long as he could, and when he looked into it its contents had indeed visibly diminished, but he gave back the horn and would not drink any more.

- Prose Edda (The Fooling of Gylfe, XIV)