They no longer walked lightly; their shoulders became bent; their eyes no longer were as bright as dewdrops. And when they looked upon one another they saw the change. Age was coming upon the Dwellers in Asgard.
They knew that the time would come when Frigga would be gray and old; when Sif's golden hair would fade; when Odin would no longer have his clear wisdom, and when Thor would not have strength enough to raise and fling his thunderbolts. And the Dwellers in Asgard were saddened by this knowledge, and it seemed to them that all brightness had gone from their shining City.
Where was Iduna whose apples would give back youth and strength and beauty to the Dwellers in Asgard? The Gods had searched for her through the World of Men. No trace of her did they find. But now Odin, searching through his wisdom, saw a means to get knowledge of where Iduna was hidden.
He summoned his two ravens, Hugin and Munin, his two ravens that flew through the earth and through the Realm of the Giants and that knew all things that were past and all things that were to come. He summoned Hugin and Munin and they came, and one sat on his right shoulder and one sat on his left shoulder and they told him deep secrets: they told him of Thiassi and of his desire for the shining apples that the Dwellers in Asgard ate, and of Loki's deception of Iduna, the fair and simple.
What Odin learnt from his ravens was told in the Council of the Gods. Then Thor the Strong went to Loki and laid hands upon him. When Loki found himself in the grip of the strong God, he said, "What wouldst thou with me, O Thor?"
"I would hurl thee into a chasm in the ground and strike thee with my thunder," said the strong God. "It was thou who didst bring it about that Iduna went from Asgard."
"O Thor," said Loki, "do not crush me with thy thunder. Let me stay in Asgard. I will strive to win Iduna back."
"The judgment of the Gods," said Thor, "is that thou, the cunning one, shouldst go to Jötunheim, and by thy craft win Iduna back from the Giants. Go or else I shall hurl thee into a chasm and crush thee with my thunder."
"I will go," said Loki.
From Frigga, the wife of Odin, Loki borrowed the dress of falcon feathers that she owned. He clad himself in it, and flew to Jötunheim in the form of a falcon.