Is wiping with one or two fingers valid for Wudu?
Chapter on Wiping over the Khuffayn (Leather Socks)
Al-Mughni
Book of Purification
Primary text
Wiping with one or two fingers is considered sufficient if the wiping is repeated until the effect is equivalent to wiping with one's fingers together. Imam Ahmad, when asked about wiping with the palms or fingers, preferred using the fingers.
Supporting text
When asked if wiping with two fingers suffices, Imam Ahmad stated that he had not heard a definitive ruling on that specific number.