Merits of the Helpers in Madinah (Ansaar)

Bukhari :: Book 5 :: Volume 58 :: Hadith 214

Narrated Um Khalid bint Khalid:

When I came from Ethiopia (to Medina), I was a young girl. Allah's Apostle made me wear a sheet having marks on it. Allah's Apostle was rubbing those marks with his hands saying, "Sanah! Sanah!" (i.e. good, good).