The Mythic World of the Navajo: The House of Father Sun
Joseph Campbell retells the Navajo story, Where the Two Came to Their Father, discussing the climax of the story, where the two heroes approach the home of their father the Sun.
For a full discussion of this story, see Mythos I: The Shaping of Our Mythic Tradition (jcf.org/works/titles/the-shaping-of-our-mythic-tradition) or The Inner Reaches of Outer Space (jcf.org/works/titles/the-inner-reaches-of-outer-space).