Sahih Bukhari | Volume 5 | Hadith Number 214

Narrated by 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).