On Clipping the Nails
Ahmad b. ‘Abd Allah narrated from Muhammad b. ‘Isa from Muhammad b. Abu al-Hasan from Abu ‘Abd Allah, peace be upon him, who said: “Whoever clips his nails every Thursday will never have inflammation of the eyes. Whoever clips them on Friday removes from under each nail an illness.” He said: “Kohl increases the light of the eyes and causes eyelashes (al-ashfar) to grow.'
From him, that he would clip his nails every Thursday beginning with the right little finger (al-khinsir), then beginning with the left. He said: “Whoever does that has taken protection from inflammation of the eyes.”