Abu Dawud Book 23, Hadith Number 3913.
Chapter : Taking omens.
Narated By Anas ibn Malik : A man said: Apostle of Allah! we were in an abode in which our numbers and our goods were many and changed to an abode in which our numbers and our goods became few. The Apostle of Allah (PBUH) said: Leave it, for it is reprehensible.