Nafi' narrates from Sayyiduna Abdullah bin Umar (may Allah be pleased with them both) that the Messenger of Allah (peace and blessings be upon him) said: "You will fight the Jews; when a Jew hides behind a stone, the stone will call out and say: 'O Muslim servant! This is a Jew behind me, so kill him.'"
Hadith Referenceالسنن الكبرى للبيهقي / كتاب السير / 18590