Yahya ibn Yahya, Yahya ibn Ayyub, Qutaybah, and Ibn Hujr narrated to us — and the wording is that of Yahya ibn Yahya. Yahya ibn Yahya said: "Informed us," while the others said: "Narrated to us" — Isma'il, who is Ibn Ja'far, from 'Abdullah ibn Dinar, that he heard Ibn 'Umar say: The Messenger of Allah, peace and blessings be upon him, said: "When the Jews greet you, one of them says, 'Al-sam 'alaykum' (death be upon you), so say, 'Wa 'alayka' (and upon you)."