Sahih Bukhari
Virtues and Merits of the Prophet (pbuh) and his Companions
Volume: 004 / Book Number: 056 / Hadith Number: 791
Narrated 'Abdullah bin 'Umar:
I heard Allah's Apostle saying, "The Jews will fight with you, and you will be given victory over them so that a stone will say, 'O Muslim! There is a Jew behind me; kill him!' "