Sahih Muslim Book 37, Hadith Number 6666.

Chapter : Throwing of non-believers in hell-fire for believers as Divine Grace and Mercy.

Abu Burda reported on the authority of his father that Allah’s Apostle (may peace be upon him) said: No Muslim would die but Allah would admit in his stead a Jew or a Christian in Hell-Fire. ‘Umar b. Abd al-‘Aziz took an oath: By One besides Whom there is no god but He, thrice that his father had narrated that to him from Allah’s Messenger (may peace be upon him).