Who will kill Ka'b b. Ashraf? He has maligned Allah, the Exalted, and His Messenger. Muhammad b. Maslama said: Messenger of Allah, do you wish that I should kill him? He said: Yes. He said: Permit me to talk (to him in the way I deem fit). He said: Talk (as you like). So, Muhammad b. Maslama came to Ka'b and talked to him, referred to the old friendship between them and said: This man (i. e. the Holy Prophet) has made up his mind to collect charity (from us) and this has put us to a great hardship. When be heard this, Ka'b said: By God, you will be put to more trouble by him. Muhammad b. Maslama said: No doubt, now we have become his followers and we do not like to forsake him until we see what turn his affairs will take. I want that you should give me a loan. He said: What will you mortgage? He said: What do you want? He said: Pledge me your women. He said: You are the most handsome of the Arabs; should we pledge our women to you? He said: Pledge me your children. He said: The son of one of us may abuse us saying that he was pledged for two wasqs of dates, but we can pledge you (cur) weapons. He said: All right. Then Muhammad b. Maslama promised that he would come to him with Harith, Abu 'Abs b. Jabr and Abbad b. Bishr. So they came and called upon him at night. He came down to them. Sufyan says that all the narrators except 'Amr have stated that his wife said: I hear a voice which sounds like the voice of murder. He said: It is only Muhammad b. Maslama and his foster-brother, Abu Na'ila. When a gentleman is called at night even it to be pierced with a spear, he should respond to the call. Muhammad said to his companions: As he comes down, I will extend my hands towards his head and when I hold him fast, you should do your job. So when he came down and he was holding his cloak under his arm, they said to him: We sense from you a very fine smell. He said: Yes, I have with me a mistress who is the most scented of the women of Arabia. He said: Allow me to smell (the scent on your head). He said: Yes, you may smell. So he caught it and smelt. Then he said: Allow me to do so (once again). He then held his head fast and said to his companions: Do your job. And they killed him. (Using translation from Muslim 1801)  

قَالَ رَسُولُ اللهِ ﷺ «مَنْ لِكَعْبِ بْنِ الْأَشْرَفِ فَإِنَّهُ قَدْ آذَى اللهَ وَرَسُولَهُ» قَالَ مُحَمَّدُ بْنُ مَسْلَمَةَ يَا رَسُولَ اللهِ «أَتُحِبُّ أَنْ أَقْتُلَهُ؟» قَالَ «نَعَمْ» قَالَ «ائْذَنْ لِي فَلْأَقُلْ» قَالَ قُلْ فَأَتَاهُ فَقَالَ لَهُ وَذِكْرُ مَا بَيْنَهُمْ قَالَ «إِنَّ هَذَا الرَّجُلَ قَدْ أَرَادَ مِنَّا صَدَقَةً وَقَدْ عَنَانَا» فَلَمَّا سَمِعَهُ قَالَ «وَأَيْضًا وَاللهِ لَتَمَلُّنَّهُ» قَالَ «إِنَّا قَدِ اتَّبَعْنَاهُ الْآنَ وَنَكْرَهُ أَنْ نَدَعَهُ حَتَّى نَنْظُرَ إِلَى أَيِّ شَيْءٍ يَصِيرُ أَمْرُهُ وَقَدْ أَرَدْتُ أَنْ تُسْلِفَنِي سَلَفًا» قَالَ «فَمَا تَرْهَنُنِي تَرْهَنُنِي نِسَاءَكُمْ؟» قَالَ «أَنْتَ أَجْمَلُ الْعَرَبِ أَنَرْهَنَكَ نِسَاءَنَا؟» قَالَ «أَتَرْهَنُونِي أَوْلَادَكُمْ» قَالَ «يَسُبُّ ابْنَ أَحَدِنَا» فَيُقَالُ «رَهْنٌ فِي وَسْقَيْنِ وَلَكِنْ نَرْهَنُكَ اللَّأْمَةَ يَعْنِي السِّلَاحَ» قَالَ «نَعَمْ فَوَاعَدَهُ أَنْ يَأْتِيَهُ إِنْ شَاءَ اللهُ فَانْطَلَقَ هُوَ وَمَعَهُ أَبُو نَائِلَةَ وَهُوَ رَضِيعُهُ وَأَخُوهُ مِنَ الرَّضَاعَةِ وَانْطَلَقَ مَعَهُ بِالْحَارِثُ وَأَبِي عَبْسِ بْنِ جَبْرٍ وَعَبَّادُ بْنُ بِشْرٍ فَجَاءُوا فَدَعُوهُ لَيْلًا فَنَزَلَ إِلَيْهِمْ» فَقَالَ سُفْيَانُ قَالَ غَيْرُ عَمْرٍو قَالَتِ امْرَأَتُهُ إِنِّي لَأَسْمَعُ صَوْتًا كَأَنَّهُ صَوْتُ دَمٍ قَالَ «إِنَّمَا هَذَا مُحَمَّدٌ وَرَضِيعُهُ أَبُو نَائِلَةَ إِنَّ الْكَرِيمَ لَوْ دُعِيَ إِلَى طَعْنَةٍ لَيْلًا لَأَجَابَ» قَالَ مُحَمَّدٌ «إِنِّي إِذَا جَاءَ فَسَوْفَ أَمُدُّ يَدَيَّ إِلَى رَأْسِهِ فَإِذَا اسْتَمْكَنْتُ مِنْهُ فَدُونَكُمْ فَلَمَّا نَزَلَ نَزَلَ وَهُوَ مُتَوَشِّحٌ» فَقَالُوا نَجْدُ مِنْكَ رِيحَ الطِّيبِ فَقَالَ «نَعَمْ تَحْتِي فُلَانَةُ أَعْطَرُ نِسَاءِ الْعَرَبِ» قَالَ «فَتَأْذَنُ لِي أَنْ أَشُمَّ مِنْهُ؟» قَالَ نَعَمْ فَشَمَّ قَالَ «فَتَنَاوَلَ فَشَمَّ» قَالَ «أَتَأْذَنُ لِي أَنْ أَعُودَ؟» قَالَ «فَاسْتَمْكَنَ مِنْ رَأْسِهِ» ثُمَّ قَالَ «دُونَكُمْ» قَالَ «فَقَتَلُوهُ»  

A liar is not one who tries to bring reconciliation amongst people and speaks good (in order to avert dispute), or he conveys good. Ibn Shihab said he did not hear that exemption was granted in anything what the people speak as lie but in three cases: in battle, for bringing reconciliation amongst persons and the narration of the words of the husband to his wife, and the narration of the words of a wife to her husband (in a twisted form in order to bring reconciliation between them). (Using translation from Muslim 2605a)   

أَنَّهَا سَمِعَتْ رَسُولَ اللهِ ﷺ يَقُولُ «لَيْسَ الْكَذَّابُ الَّذِي يُصْلِحُ بَيْنَ النَّاسِ فَيَنْمِي خَيْرًا أَوْ يَقُولُ خَيْرًا» قَالَتْ وَلَمْ أَسْمَعْهُ يُرَخَّصُ فِي شَيْءٍ مِنَ الْكَذِبِ مِمَّا يَقُولُ النَّاسُ إِلَّا فِي ثَلَاثٍ فِي الْحَرْبِ وَالْإِصْلَاحِ بَيْنَ النَّاسِ وَحَدِيثِ الرَّجُلِ امْرَأَتَهُ وَحَدِيثِ الْمَرْأَةِ زَوْجَهَا وَكَانَتْ أُمُّ كُلْثُومٍ مِنَ الْمُهَاجِرَاتِ اللَّاتِي بَايَعْنَ رَسُولَ اللهِ ﷺ  

Jabir reported the Apostle of Allaah ﷺ as saying “War is deception.” (Using translation from Abū Dāʾūd 2636)   

قَالَ النَّبِيُّ ﷺ «الْحَرْبُ خَدْعَةٌ»  

[Machine] I heard Ali ibn Abi Talib saying about something that Allah and His Messenger have confirmed. I said, "This is something I have heard." He replied, "The Messenger of Allah ﷺ said, 'War is deceit.'"  

سَمِعْتُ عَلِيَّ بْنَ أَبِي طَالِبٍ يَقُولُ فِي شَيْءٍ صَدَقَ اللهُ وَرَسُولُهُ قُلْتُ «هَذَا شَيْءٌ سَمِعْتُهُ» قَالَ قَالَ رَسُولُ اللهِ ﷺ «الْحَرْبُ خَدْعَةٌ»