Abu Dawud Book 30, Hadith Number 4235.
Chapter : Fitan and their predictions.
Narated By N/A : The tradition mentioned above has also been transmitted by Hudhaifah through a different chain of narrators from the Prophet (PBUH). This Version says: He said: If you do not find a caliph in those days, then flee away until you die, even if you die holding on (to a stump of a tree). I asked: What will come next? He replied: If a man want’s the mare to bring forth a foal, it will not deliver till the Last Hour comes.