Purity: Direction Required for Washing the Face and Arms in Wuḍūʾ

Practical Laws of Islam as per the teachings of Ayatullah Sistani

Ruling 242

The direction in which one must wash the arms is from top to bottom [i.e. in a direction towards the fingertips]. The same applies, based on obligatory precaution, to washing the face [i.e. it must be washed in a direction towards the chin]. If a person washes from bottom to top, the wuḍūʾ is invalid.

-Ayatullah Sistani, Practical Laws of Islam, Purification (Taharah)