Al-Kāfi

7. A number of our people have narrated from Sahl ibn Ziyad from Muhammad ibn Ahmad al-Daqqaq from Muhammad ibn ’Isma‘il from Salih ibn ‘Uqbah from Bashir al-Dahhan who has said the following: “Abu ‘Abd Allah (a.s.), has said, ‘If one applies oil on a believing person, Allah writes for every hair a light on the Day of Judgment.’”