Ibn 'Abbas was asked about someone who killed a believer deliberately then he repented, believed and did righteous deeds, and followed true guidance. Ibn 'Abbas said: "There is no way he could repent! I heard your Prophet say; He (the victim) will come hanging onto his killer with his jugular veins flowing with blood and saying: "Ask him why he killed me." Then he said: "by Allah, Allah revealed it and never abrogated anything of it.
Reference: Sunan an-Nasa'i 4866 In-book : Book 45, Hadith 161 English translation : Vol. 5, Book 45, Hadith 4870
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