Musnad Ahmad 788:78

'Affan narrated to us, Shu'bah narrated to us, Abu Bishr informed me, he said: I heard Sa'id ibn Jubayr, from Abu Musa, from the Prophet, may God bless him and grant him peace, who said: "Whoever among my nation, or a Jew, or a Christian hears of me, then does not believe in me, shall enter the Fire."