‘Amr bin Aws narrated that his father, Aws, told him:
“We were
sitting with the Prophet ﷺ and he was narrating to us and
reminding us, when a man came and spoke privately to him. He said:
‘Take him away and kill him.’ When the man turned away, the
Messenger
of Allah ﷺ called him back and said: ‘Do you bear
witness that
none has the right to be worshiped but Allah?’ He
said, ‘Yes.’ He
said: ‘Then go and let him go, for I have been
commanded to fight the
people until they say: La ilaha illallah, then
if they do that, their
blood and wealth are forbidden to me.’”

حَدَّثَنَا أَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ، حَدَّثَنَا عَبْدُ اللَّهِ بْنُ بَكْرٍ السَّهْمِيُّ، حَدَّثَنَا حَاتِمُ بْنُ أَبِي صَغِيرَةَ، عَنِ النُّعْمَانِ بْنِ سَالِمٍ، أَنَّ عَمْرَو بْنَ أَوْسٍ، أَخْبَرَهُ أَنَّ أَبَاهُ أَوْسًا أَخْبَرَهُ قَالَ إِنَّا لَقُعُودٌ عِنْدَ النَّبِيِّ ـ ﷺ ـ وَهُوَ يَقُصُّ عَلَيْنَا وَيُذَكِّرُنَا إِذْ أَتَاهُ رَجُلٌ فَسَارَّهُ فَقَالَ النَّبِيُّ ـ ﷺ ـ " اذْهَبُوا بِهِ فَاقْتُلُوهُ " . فَلَمَّا وَلَّى الرَّجُلُ دَعَاهُ رَسُولُ اللَّهِ ـ ﷺ ـ فَقَالَ " هَلْ تَشْهَدُ أَنْ لاَ إِلَهَ إِلاَّ اللَّهُ " . قَالَ نَعَمْ قَالَ " اذْهَبُوا فَخَلُّوا سَبِيلَهُ فَإِنَّمَا أُمِرْتُ أَنْ أُقَاتِلَ النَّاسَ حَتَّى يَقُولُوا لاَ إِلَهَ إِلاَّ اللَّهُ فَإِذَا فَعَلُوا ذَلِكَ حَرُمَ عَلَىَّ دِمَاؤُهُمْ وَأَمْوَالُهُمْ " .