Abu Dawud Book 27, Hadith Number 4052.
Chapter : Washing the clothes and wearing wornout and dirty clothes.
Narated By Abu al-Ahwas Awf ibn Malik : I came to the Prophet (PBUH) wearing a poor garment and he said (to me): Have you any property? He replied: Yes. He asked: What kind is it? He said: Allah has given me camels. Sheep, horses and slaves. He then said: When Allah gives you property, let the mark of Allah’s favour and honour to you be seen.