Read and reflect on verse 585 from Surah An-Nisaa: AND IT IS not conceivable that a believer should slay another believer, unless it be by mistake. And upon him who has slain a believer by mistake ther...
وَمَا كَانَ لِمُؤْمِنٍ أَنْ يَقْتُلَ مُؤْمِنًا إِلَّا خَطَأً ۚ وَمَنْ قَتَلَ مُؤْمِنًا خَطَأً فَتَحْرِيرُ رَقَبَةٍ مُؤْمِنَةٍ وَدِيَةٌ مُسَلَّمَةٌ إِلَىٰ أَهْلِهِ إِلَّا أَنْ يَصَّدَّقُوا ۚ فَإِنْ كَانَ مِنْ قَوْمٍ عَدُوٍّ لَكُمْ وَهُوَ مُؤْمِنٌ فَتَحْرِيرُ رَقَبَةٍ مُؤْمِنَةٍ ۖ وَإِنْ كَانَ مِنْ قَوْمٍ بَيْنَكُمْ وَبَيْنَهُمْ مِيثَاقٌ فَدِيَةٌ مُسَلَّمَةٌ إِلَىٰ أَهْلِهِ وَتَحْرِيرُ رَقَبَةٍ مُؤْمِنَةٍ ۖ فَمَنْ لَمْ يَجِدْ فَصِيَامُ شَهْرَيْنِ مُتَتَابِعَيْنِ تَوْبَةً مِنَ اللَّهِ ۗ وَكَانَ اللَّهُ عَلِيمًا حَكِيمًا
AND IT IS not conceivable that a believer should slay another believer, unless it be by mistake. And upon him who has slain a believer by mistake there is the duty of freeing a believing soul from bondage and paying an indemnity to the victim's relations, unless they forgo it by way of charity. Now if the slain, while himself a believer, belonged to a people who are at war with you, [the penance shall be confined to] the freeing of a believing soul from bondage; whereas, if he belonged to a people to whom you are bound by a covenant, [it shall consist of] an indemnity to be paid to his relations in addition to the freeing of a believing soul from bondage. And he who does not have the wherewithal shall fast [instead] for two consecutive months. (This is) the atonement ordained by God: and God is indeed all-knowing, wise.