Musannaf Ibn Abi Shayba 18:1007

Abu Bakr narrated to us, he said: Ibn Fudayl narrated to us, from Abu Nasr and Yahya al-Jabir, from Salim ibn Abi al-Ja’d, from Ibn Abbas, who said: A man came to him and said: "O Abu Abbas, what do you say about a man who kills a believer intentionally; what is his recompense?" He said: "His recompense is Hell, wherein he will abide eternally, and Allah has become angry with him," [reciting] the verse. The man said: "What if he repents, believes, does righteous deeds, and then remains guided?" He said: "And how could there be repentance for him? May your mother be bereaved of you! He will come on the Day of Resurrection holding his head, his jugular veins gushing with blood, until he stands with him before the Throne, and he will say: 'O Lord, ask this one for what he killed me.'"