But when they came to the smithy, Sindre laid a pig-skin in the furnace and requested Brok to blow the bellows, and not to stop blowing before he (Sindre) had taken out of the furnace what he had put into it. ... That was now a boar, and its bristles were of gold. ... to Frey he gave the boar, stating that it would run through the air and over seas, by night or by day, faster than any horse; and never could it become so dark in the night, or in the worlds of darkness, but that it would be light where this boar was present, so bright shone his bristles.
Then he gave to Thor the hammer, and said that he might strike with it as hard as he pleased; no matter what was before him, the hammer would take no scathe, and wherever he might throw it he would never lose it; it would never fly so far that it did not return to his hand; and if he desired, it would become so small that he might conceal it in his bosom; but it had one fault, which was, that the handle was rather short.
— The Younger Edda