Abu Dawud Book 27, Hadith Number 4022.
Chapter : Wearing clothes of wool and hair.
Narated By Abu Musa al-Ash’ari : Abu Burdah said: My father said to me: My son, if you had seen us while we were with the Apostle of Allah (PBUH) and the rain had fallen on us, you would have thought that our smell was the smell of the sheep.