Musannaf Ibn Abi Shaybah 26059 — With how many fingers one eats

Muhammad bin Abdullah, the nephew of al-Zuhri, said: My sister told me that she saw al-Zuhri eating with five fingers. So she asked al-Zuhri about this, and al-Zuhri said: The Prophet (peace and blessings be upon him) also used to eat with five fingers.