Musnad Ahmad 27:1572

Abu al-Yaman narrated to us, Shu'ayb informed us, from al-Zuhri, Salim ibn 'Abd Allah informed me, that 'Abd Allah ibn 'Umar said: I heard the Prophet, peace and blessings of Allah be upon him, saying: "The Jews will fight you, and you will be given power over them, until the stone will say: 'O Muslim, this is a Jew behind me, so kill him.'"