وَأَيْدِيَكُمْ إِلَى الْمَرَافِقِ
Meaning: And wash your hands and arms to the elbows.
The fingers, hands, wrists, and arms are included; the three Hanafi authorities include the elbows as well.
Starting at the fingers accords with the usual method, while the obligation here is to wash the whole prescribed area.