Sahih Bukhari
Fighting for the Cause of Allah (Jihaad)
Volume: 004 / Book Number: 052 / Hadith Number: 176
Narrated 'Abdullah bin 'Umar:
Allah's Apostle said, "You (i.e. Muslims) will fight wi the Jews till some of them will hide behind stones. The stones will (betray them) saying, 'O 'Abdullah (i.e. slave of Allah)! There is a Jew hiding behind me; so kill him.' "