The verse "If a man kills a believer intentionally, his recompense is Hell to abide therein for ever" was revealed six months after the verse "And those who invoke not with Allah any other god, nor slay such life as Allah has made sacred, except for just cause in Surat al-Furqan.
Reference: Sunan Abi Dawud 4272 In-book : Book 37, Hadith 33 English translation : Book 36, Hadith 4259
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