In Jambavan's telling, Lord Hanuman was still a child when, hungry in the forest, he saw the risen Sun, Lord Surya, and took him for a fruit. He sprang up and leapt into the sky.1
He went three thousand yojanas. The Sun's energy struck him, yet his spirit did not fail.2
Lord Indra saw him rushing through the heavens and, growing angry, hurled his thunderbolt at him. At that, Hanuman's left jaw was broken, and he fell on the mountaintop. From this, says Jambavan, his name has been known as Hanuman.3
Lord Vayu, the Wind, saw his son beaten back and, in his anger, stopped blowing through the three worlds. The gods, afraid as the worlds were thrown into turmoil, began to calm him.4
Once the Wind was calmed, Lord Brahma granted a boon: the Wind's son would not be slain in battle by weapons.5
Seeing that the thunderbolt had left Hanuman without serious injury, Indra, "He of a thousand eyes", was pleased and granted a boon of his own: Hanuman's death would come according to his own will.6