Sunan An-Nasa'i

It was narrated from Salim bin abi Ja'd that: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