Sahih Muslim Book 043, Hadith Number 7171.
Chapter : Not known.
Sa'id b. Jubair reported: 'Abd al Rahman b. Abzi commanded me that I should ask Ibn 'Abbas about these two verses: "He who slays a believer intentionally his requital shall be Hell where he would abide for ever" (iv. 92). So, I asked him and he said: Nothing has abrogated it. And as for this verse: "And they who call not upon another god with Allah and slay not the soul which Allah has forbidden,except in the cause of justice" (xxv. 68), he (Ibn Abbas) said: This has been revealed in regard to the polytheists."