By the One in Whose Hand Muhammad's soul is, there is nobody of this Ummah (community), whether they be Jewish or Christian, who hears of me and then dies without believing in what I was sent with except that he will be among the people of Hellfire

The Prophet (may Allah's peace and blessings be upon him) swears by Allah that none of this nation, be he Jewish or Christian or otherwise, who hears of the Prophet (may Allah's peace and blessings be upon him) and of his message then dies without believing in him except that he will be among the dwellers of Hellfire who will reside therein forever.