Q. What did Prophet Muhammad (peace be upon him) say about the punishment for those who murder a believer intentionally and the repentance of those who have committed sins?
 Narrated Sa`id bin Jubair:                     Ibn Abza said to me, "Ask Ibn `Abbas regarding the Statement of Allah: 'And whoever murders a believer intentionally, his recompense is Hell.' (4.69) And also His Statement: '...nor kill such life as Allah has forbidden, except for a just cause .....except those who repent, believe, and do good deeds.' " (25.68-70) So I asked Ibn `Abbas and he said, "When this (25.68-69) was revealed, the people of Mecca said, "We have invoked other gods with Allah, and we have murdered such lives which Allah has made sacred, and we have committed illegal sexual intercourse. So Allah revealed: 'Except those who repent, believe, and do good deeds and Allah is Oft-Forgiving, Most Merciful.' (25.70)