Narrated Sa`id bin Jubair:
`AbdurRahman bin Abza said, "Ask Ibn `Abbas about these two Qur'anic Verses: 'Nor kill such life as Allah has made sacred, Except for just cause.' (25.168) "And whoever kills a believer intentionally, his recompense is Hell. (4.93) So I asked Ibn `Abbas who said, "When the Verse that is in Sura-al-Furqan was revealed, the pagans of Mecca said, 'But we have slain such life as Allah has made sacred, and we have invoked other gods along with Allah, and we have also committed fornication.' So Allah revealed:-- 'Except those who repent, believe, and do good-- (25.70) So this Verse was concerned with those people. As for the Verse in Surat-an-Nisa (4-93), it means that if a man, after understanding Islam and its laws and obligations, murders somebody, then his punishment is to dwell in the (Hell) Fire forever." Then I mentioned this to Mujahid who said, "Except the one who regrets (one's crime) . "