Yahya related to me from Malik from as-Salt ibn Zubayd from morethan one of his family that Umar ibn al-Khattab discovered the smellof perfume while he was at ash-Shajara. Kathir ibn as-Salt was at hisside, and Umar asked, "Who is this smell of perfume coming from?", andKathir said, "From me, amir al-muminin. I matted my hair with perfumeand I intended not to shave it.'' Umar said, "Go to a sharaba and rubyour head until it is clean," and Kathir did so.Malikexplained, "A sharaba is the ditch at the base of a date-palm."
USC-MSA web (English) reference: Book 20, Hadith 20
Arabic reference: Book 20, Hadith 729