Ali ibn Muhammad from Sahl ibn Ziyad from
Ja’far ibn Muhammad al-Ash‘ari from ‘Abdallah ibn Maymun al-Qaddah from abu
‘Abdallah (a.s.) from his ancestors (the Imams (a. s.) who has said the
following. "Once a man came to the holy Prophet (s.a.) and said, ‘O
messenger of Allah what is knowledge?’ The holy Prophet replied, "It is
silence." The man then asked, "Then what?" The holy Prophet
said, "It is listening." The man asked, "Then what?" The
holy Prophet (s.a.) said, "Then it is memorizing." The man asked,
"Then what?" The holy Prophet said, "Then it is practice
accordingly." The man then asked, "Then what O messenger of
Allah?" The holy Prophet said, "Then it is to propagate what one has
learned."
H 127, Ch. 16, h 4 Kitab Al Kafi