What body part was weighed against a feather in the afterlife judgment?

The story behind the answer

Heart. In the Hall of Two Truths, Anubis weighed the deceased’s heart against the feather of Ma’at, the goddess of truth and justice. If the heart was as light as the feather—free of wrongdoing—Thoth recorded a favorable verdict and the soul was declared “true of voice,” allowed to join Osiris in the afterlife. If heavier, Ammit, the Devourer, consumed it, ending the soul’s journey.

Egyptians saw the heart as the seat of thought, memory, and conscience—unlike the brain, which was often discarded