أَجْزَاؤُهُمُ الْأَصْلِيَّةُ
Their original components.
These are the bodily components understood to preserve the individual's essential bodily identity. The qualifier original must be distinguished from a requirement to restore every temporary addition. A person eats, grows, loses weight, and undergoes bodily changes without thereby becoming an entirely different person at every moment.
Different explanations of the original parts appear in the classical discussion: some connect them with the earliest relation of the soul to the body, while others emphasize the stable, identity-bearing constituents. The precise material identification of these constituents is not itself the central article of faith.