I asked Ibn 'Abbas (about the verse relating to intentional homicide in Surat An-Nisa') He said: When the verse "Those who invoke not with Allah any other god, nor slay such life as Allah had made sacred, except for just cause" was revealed, the polytheists of Mecca said: We have killed the soul prohibited by Allah, invoked another god along with Allah for worship, and committed shameful deeds. So Allah revealed the verse "unless he repents, believes, and works righteous deeds, for Allah will change the evil of such persons into good." This is meant for them. As regards the verse "if a man kills a believer intentionally, his recompense is Hell" He said: If a man knows the command of Islam and intentionally kills a believer, his repentance wil not be accepted. I then mentioned it to Mujahid. He said: "Except the one who is ashamed (of his sin)."  

لَمَّا نَزَلَتِ الَّتِي فِي الْفُرْقَانِ { وَالَّذِينَ لاَ يَدْعُونَ مَعَ اللَّهِ إِلَهًا آخَرَ وَلاَ يَقْتُلُونَ النَّفْسَ الَّتِي حَرَّمَ اللَّهُ إِلاَّ بِالْحَقِّ } قَالَ مُشْرِكُو أَهْلِ مَكَّةَ قَدْ قَتَلْنَا النَّفْسَ الَّتِي حَرَّمَ اللَّهُ وَدَعَوْنَا مَعَ اللَّهِ إِلَهًا آخَرَ وَأَتَيْنَا الْفَوَاحِشَ فَأَنْزَلَ اللَّهُ { إِلاَّ مَنْ تَابَ وَآمَنَ وَعَمِلَ عَمَلاً صَالِحًا فَأُولَئِكَ يُبَدِّلُ اللَّهُ سَيِّئَاتِهِمْ حَسَنَاتٍ } فَهَذِهِ لأُولَئِكَ قَالَ وَأَمَّا الَّتِي فِي النِّسَاءِ { وَمَنْ يَقْتُلْ مُؤْمِنًا مُتَعَمِّدًا فَجَزَاؤُهُ جَهَنَّمُ } الآيَةُ قَالَ الرَّجُلُ إِذَا عَرَفَ شَرَائِعَ الإِسْلاَمِ ثُمَّ قَتَلَ مُؤْمِنًا مُتَعَمِّدًا فَجَزَاؤُهُ جَهَنَّمُ لاَ تَوْبَةَ لَهُ فَذَكَرْتُ هَذَا لِمُجَاهِدٍ فَقَالَ إِلاَّ مَنْ نَدِمَ  

[Machine] Regarding the verse in Surat Al-Furqan [25:68] "And those who do not invoke with Allah another deity" until His statement [25:68] "And they do not commit adultery", and regarding the verse in An-Nisa [4:93] "And whoever kills a believer intentionally" until the end of the verse, I asked Ibn Abbas about it, and he said, when the verse in Al-Furqan was revealed, the polytheists of Makkah said, "We have killed the soul that Allah has forbidden and associated partners with Allah. And we have committed indecencies." So Allah revealed [25:70] "Except for those who repent, believe, and do righteous deeds; for them Allah will replace their evil deeds with good." For those, he said, regarding the verse in An-Nisa [4:93] "And whoever kills a believer intentionally" until His statement [4:93] "Great sin", the man said, when a person embraces Islam and learns its laws and then kills a believer intentionally, his punishment is Hellfire and there is no repentance for him. So I mentioned that to Mujahid, and he said, except for one who feels remorse.  

عَنِ الْآيَةِ الَّتِي فِي سُورَةِ الْفُرْقَانِ {وَالَّذِينَ لَا يَدْعُونَ مَعَ اللهِ إِلَهًا آخَرَ} [الفرقان 68] إِلَى قَوْلِهِ {وَلَا يَزْنُونَ} [الفرقان 68] وَعَنِ الْآيَةِ الَّتِي فِي النِّسَاءِ {وَمَنْ يَقْتُلْ مُؤْمِنًا مُتَعَمِّدًا} [النساء 93] إِلَى آخِرِ الْآيَةِ قَالَ فَسَأَلْتُ ابْنَ عَبَّاسٍ عَنْ ذَلِكَ قَالَ لَمَّا أُنْزِلَتِ الَّتِي فِي الْفُرْقَانِ قَالَ مُشْرِكُوا أَهْلِ مَكَّةَ قَدْ قَتَلْنَا النَّفْسَ الَّتِي حَرَّمَ اللهُ وَدَعَوْنَا مَعَ اللهِ إِلَهًا آخَرَ وَقَدْ أَتَيْنَا الْفَوَاحِشَ قَالَ فَأَنْزَلَ اللهُ تَعَالَى {إِلَّا مَنْ تَابَ وَآمَنَ وَعَمِلَ عَمَلًا صَالِحًا فَأُولَئِكَ يُبَدِّلُ اللهُ سَيِّئَاتِهِمْ حَسَنَاتٍ} [الفرقان 70] فَهَذِهِ لِأُولَئِكَ قَالَ وَأَمَّا الَّتِي فِي النِّسَاءِ {وَمَنْ يَقْتُلْ مُؤْمِنًا مُتَعَمِّدًا} [النساء 93] قَرَأَ إِلَى قَوْلِهِ {عَظِيمًا} [النساء 27] قَالَ الرَّجُلُ إِذَا عَرَفَ الْإِسْلَامَ وَعَلِمَ شَرَائِعَ الْإِسْلَامِ ثُمَّ قَتَلَ مُؤْمِنًا مُتَعَمِّدًا فَجَزَاؤُهُ جَهَنَّمُ وَلَا تَوْبَةَ لَهُ فَذَكَرْتُ ذَلِكَ لِمُجَاهِدٍ فَقَالَ إِلَّا مِنْ نَدِمَ