Musannaf Ibn Abi Shaybah

Hazrat Abu Hakimah Abdi narrates that we used to write manuscripts in Kufa. Once, while we were writing, Hazrat Ali (may Allah be pleased with him) passed by us and said, "Keep the tip of your pen broad." So I cut my pen and made it broad, then wrote. He said, "In this way, illuminate this thing just as Allah has given it light."