Final answer:
The 'Psychostasis' depicted in the 'Book of the Dead' of Hu-Nefer, part of ancient Theban ceremonies, illustrates the belief that the god Anubis weighed the dead's heart against Maat's feather to determine their worthiness for the afterlife, reflecting the Egyptian emphasis on moral living.
Step-by-step explanation:
Thebes, an ancient Egyptian city, was known for its ceremonies and rituals associated with death and the afterlife. The Psychostasis, or 'soul-raising', was an integral part of these ceremonies, depicted vividly in the 'Book of the Dead' of Hu-Nefer. The illustrations in the papyrus scrolls such as this, provided a comprehensive guide to the deceased for navigating the afterlife, including scenes where the god Anubis weighs the heart of the deceased against a feather, symbolizing Maat, the concept of truth and order. A heart that balances with the feather would indicate a life lived in accordance with Maat, allowing the soul to be presented to Osiris. On the contrary, a heart heavier than the feather, due to being laden with sins, would be devoured by a fearsome beast, resulting in the soul's annihilation.
Anubis, the jackal-headed god, was responsible for escorting the dead to the scales and supervising the weighing of the heart. If the scales were balanced, the deceased was deemed 'justified' or 'true of voice' and could be brought before Osiris, the lord of the underworld, by Horus. These beliefs and rituals underscored the ancient Egyptian focus on morality and the afterlife, elements that were essential for achieving eternal life.