How does the iconography of Judgment of Hunefer Before Osiris correspond to the function of "Books of the Dead"?

What will be an ideal response?

The ideal answer should include:
1. Books of the Dead were magical texts or spells that helped the dead pass the god Osiris's tests that judged the righteousness of the souls of the dead.
2. Judgment of Hunefer Before Osiris depicts three successive stages of Hunefer's induction into the afterlife.
3. On the left side of the composition, the jackal-headed god Anubis leads Hunefer, who is depicted in the conventional composite pose, to the area where he will weigh Hunefer's heart against the "feather of truth."
4. Then, the ibis-headed god Thoth records Hunefer's passing of the test and Horus presents the man to the enthroned god Osiris, who holds a crook and a flail.