Sunan an-Nasa'i, Hadith 3982 ⓘ
It was narrated that An-Nu'man bin Salim said: "I heard Aws say: 'I came to the Messenger of Allah [SAW] among the delegation of Thaqif and I was with him in a tent. Everyone in the tent had gone to sleep except him and I. A man came and whispered to him, and he said: Go and kill him. Then he said: Does he not bear witness to La ilaha illallah (there is none worthy of worship except Allah) and that I am the Messenger of Allah? He said: He does bear witness to that. The Messenger of Allah [SAW] said: Leave him alone. Then he said: I have been commanded to fight the people until they say La ilaha illallah. If they say it, then their blood and their wealth become forbidden to me, except for a right that is due. (One of the narrators) Muhammad said: I said to Shu'bah: 'Doesn't the Hadith contain: Does he not testify to La ilaha illallah (there is none worthy of worship except Allah) and that I am the Messenger of Allah?' He said: 'I think it is both, but I do not know.'"
أَخْبَرَنَا مُحَمَّدُ بْنُ بَشَّارٍ، قَالَ حَدَّثَنَا مُحَمَّدٌ، قَالَ حَدَّثَنَا شُعْبَةُ، عَنِ النُّعْمَانِ بْنِ سَالِمٍ، قَالَ سَمِعْتُ أَوْسًا، يَقُولُ أَتَيْتُ رَسُولَ اللَّهِ صلى الله عليه وسلم فِي وَفْدِ ثَقِيفٍ فَكُنْتُ مَعَهُ فِي قُبَّةٍ فَنَامَ مَنْ كَانَ فِي الْقُبَّةِ غَيْرِي وَغَيْرُهُ فَجَاءَ رَجُلٌ فَسَارَّهُ فَقَالَ " اذْهَبْ فَاقْتُلْهُ " . فَقَالَ " أَلَيْسَ يَشْهَدُ أَنْ لاَ إِلَهَ إِلاَّ اللَّهُ وَأَنِّي رَسُولُ اللَّهِ " . قَالَ يَشْهَدُ . فَقَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم " ذَرْهُ " . ثُمَّ قَالَ " أُمِرْتُ أَنْ أُقَاتِلَ النَّاسَ حَتَّى يَقُولُوا لاَ إِلَهَ إِلاَّ اللَّهُ فَإِذَا قَالُوهَا حَرُمَتْ دِمَاؤُهُمْ وَأَمْوَالُهُمْ إِلاَّ بِحَقِّهَا " . قَالَ مُحَمَّدٌ فَقُلْتُ لِشُعْبَةَ أَلَيْسَ فِي الْحَدِيثِ " أَلَيْسَ يَشْهَدُ أَنْ لاَ إِلَهَ إِلاَّ اللَّهُ وَأَنِّي رَسُولُ اللَّهِ " . قَالَ أَظُنُّهَا مَعَهَا وَلاَ أَدْرِي .
also referenced under: Book 37, Hadith 17 (In-Book) & Volume 5, Book 37, Hadith 3987 (DarusSalam)