عَنِ الْأَسْوَدِ بْنِ سَرِيعٍ رَضِيَ اللَّهُ عَنْهُ قَالَ أَتَيْتُ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ وَغَزَوْتُ مَعَهُ فَأَصَبْتُ ظَهْرًا فَقَتَلَ النَّاسُ يَوْمَئِذٍ حَتَّى قَتَلُوا الْوِلْدَانَ وَقَالَ مَرَّةً الذُّرِّيَّةَ فَبَلَغَ ذَلِكَ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ فَقَالَ مَا بَالُ أَقْوَامٍ جَاوَزَهُمُ الْقَتْلُ الْيَوْمَ حَتَّى قَتَلُوا الذُّرِّيَّةَ فَقَالَ رَجُلٌ يَا رَسُولَ اللَّهِ إِنَّمَا هُمْ أَوْلَادُ الْمُشْرِكِينَ فَقَالَ أَلَا إِنَّ خِيَارَكُمْ أَبْنَاءُ الْمُشْرِكِينَ ثُمَّ قَالَ أَلَا لَا تَقْتُلُوا ذُرِّيَّةً أَلَا لَا تَقْتُلُوا ذُرِّيَّةً قَالَ كُلُّ نَسَمَةٍ تُولَدُ عَلَى الْفِطْرَةِ حَتَّى يُعْرِبَ عَنْهَا لِسَانُهَا فَأَبَوَاهَا يُهَوِّدَانِهَا وَيُنَصِّرَانِهَا
Narrated from Sayyiduna Aswad bin Sari’ (may Allah be pleased with him), he says: I came to the Messenger of Allah (peace and blessings be upon him) and participated in jihad with him, and I was also given a mount. That day, people engaged in such killing that even children and women were killed. When the Messenger of Allah (peace and blessings be upon him) found out, he said: What has happened to the people? Today, killing has exceeded its limits, to the extent that they have killed women and children as well. A man said: O Messenger of Allah! They are the children of the polytheists. The Messenger of Allah (peace and blessings be upon him) said: Beware! Even the most beloved among you are the children of polytheists. Then he (peace and blessings be upon him) said: Beware! Do not kill children and women, beware! Do not kill children and women. Then he said: Every soul is born upon the natural disposition, until its tongue begins to clarify, and its parents make it a Jew or a Christian.