The Book of Oaths (qasamah), Retaliation and Blood Money

"‏ يَجِيءُ مُتَعَلِّقًا بِالْقَاتِلِ تَشْخَبُ أَوْدَاجُهُ دَمًا يَقُولُ سَلْ هَذَا فِيمَ قَتَلَنِي ‏"

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.

"‏ الْكَبَائِرُ الشِّرْكُ بِاللَّهِ وَعُقُوقُ الْوَالِدَيْنِ وَقَتْلُ النَّفْسِ وَقَوْلُ الزُّورِ ‏"

"I heard Ana's say: 'The Messenger of Allah said: 'the major sins are; associating others with Allah (shirk), disobeying one's parents, killing a soul (murder) and speaking falsely.

"‏ الْكَبَائِرُ الإِشْرَاكُ بِاللَّهِ وَعُقُوقُ الْوَالِدَيْنِ وَقَتْلُ النَّفْسِ وَالْيَمِينُ الْغَمُوسُ ‏"

"The major sins are: associating others with Allah, disobeying parents, killing a souls (murder) and swearing a false oath knowingly.

"‏ لاَ يَزْنِي الْعَبْدُ حِينَ يَزْنِي وَهُوَ مُؤْمِنٌ وَلاَ يَشْرَبُ الْخَمْرَ حِينَ يَشْرَبُهَا وَهُوَ مُؤْمِنٌ وَلاَ يَسْرِقُ وَهُوَ مُؤْمِنٌ وَلاَ يَقْتُلُ وَهُوَ مُؤْمِنٌ ‏"

"The Messenger of Allah said: 'No one who commits Zina is a believer at the moment when he is committing Zina, and no one who drinks wine is a believer at the moment when he is drinking it, and no thief is a believer at the moment when he is stealing, and no killer is a believer at the moment he is killing