وَعَنْ أُسَامَةَ بْنِ زَيْدٍ قَالَ: بَعَثَنَا رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ إِلَى أُنَاسٍ مِنْ جُهَيْنَةَ فَأَتَيْتُ عَلَى رَجُلٍ مِنْهُمْ فَذَهَبْتُ أَطْعَنُهُ فَقَالَ: لَا إِلَهَ إِلَّا اللَّهُ فَطَعَنْتُهُ فَقَتَلْتُهُ فَجِئْتُ إِلَى النَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ فَأَخْبَرْتُهُ فَقَالَ: «أقَتلتَه وقدْ شَهِدَ أَنْ لَا إِلَهَ إِلَّا اللَّهُ؟» قُلْتُ: يَا رَسُولَ اللَّهِ إِنَّمَا فَعَلَ ذَلِكَ تَعَوُّذًا قَالَ: «فهَلاَّ شقَقتَ عَن قلبه؟»
Usama b. Zaid said:God’s Messenger sent us to some people of Juhaina, and I attacked one of them and was about to spear him when he said, “There is no god but God.” I then speared him and killed him, after which I went and told the Prophet. He said, “Did you kill him when he had testified that there is no god but God?” I replied, “Messenger of God, he did that only as a means to escape death.” He asked, “Why did you not split his heart?” Bukhari and Muslim.