The Prophet ﷺ sent Khalid bin Walid to a tribe, I think he said Jadhima, and Khalid called them to Islam. They could not pronounce "We have submitted" properly, so they began saying, "Sabana, sabana." Khalid started taking them captive and killing them, and he handed over to each one of us a captive. Then one morning Khalid ordered each of us to kill his captive.Ibn Umar said, "By Allah, I will not kill my captive, nor will any of my companions kill his captive."They came back to the Prophet ﷺ and told him what Khalid had done. The Prophet ﷺ raised his hands and said, "O Allah, I declare myself innocent before You of what Khalid has done," saying it twice.
حدثنا عبد الرزاق حدثنا معمر عن الزهري عن سالم بن عبد الله
بعث النبي ﷺ خالد بن الوليد إلى بني أحسبه قال جذيمة فدعاهم إلى الإسلام فلم يحسنوا أن يقولوا أسلمنا فجعلوا يقولون صبأنا صبأنا وجعل خالد بهم أسرا وقتلا قال ودفع إلى كل رجل منا أسيرا حتى إذا أصبح يوما أمر خالد أن يقتل كل رجل منا أسيره قال ابن عمر فقلت والله لا أقتل أسيري ولا يقتل رجل من أصحابي أسيره قال فقدموا على النبي ﷺ فذكروا له صنيع خالد فقال النبي ﷺ ورفع يديه اللهم إني أبرأ إليك مما صنع خالد مرتين
Its chain of transmission is sahih. Bukhari related it at 8:45-46 and 13:158, from Mahmud bin Ghaylan, from Abdul-Razzaq, and also from Naeem bin Hammad, from Ibn Mubarak, both of them from Mamar, with this same chain. Nasai related it at 2:308 by way of Ibn Mubarak, Hisham bin Yusuf, and Abdul-Razzaq, all three of them from Mamar, in the same manner. Ibn Kathir cited it in Tarikh 4:313-314 from this very passage, then said, Bukhari and Nasai related it from the hadith of Abdul-Razzaq, in the same manner, in similar wording. He also cited it in Tafsir 2:535-536 from the narration of Bukhari, but inserted into it material that does not belong there, which is what Ibn Ishaq related from Hakeem bin Hakeem from Abu Jafar Muhammad bin Ali as a mursal report. This is a strange oversight on his part.This incident took place right after the conquest of Makkah, in Shawwal of year 8 of the Hijrah, before the departure to Hunayn. Ibn Saad said in Tabaqat 1/2/106, Then there was the expedition of Khalid bin Walid against Banu Judhaymah of Kinanah, who were located below Makkah, a night's journey toward Yalamlam, in Shawwal of year eight from the migration of the Messenger of Allah, and it is the day of Ghumaysa. See the detailed account of the story in Ibn Saad, and in Sirat bin Hisham (pages 833-839 of the European edition, and 4:53-63 of the edition by Shaykh Muhyi al-Din Abdul-Hameed).Banu Judhaymah, with the jim vowelled with fatha and the dhal (the dotted one) vowelled with kasra, are Banu Judhaymah bin Amir bin Abd Manat bin Kinanah. See Jamharat Ansab 177, and Mujam Qabail Arab 176. The Hafiz said in Fath al-Bari 8:45, Kirmani made an error here, supposing that they belonged to Banu Judhaymah bin Awf bin Bakr bin Awf, a tribe of Abdul-Qays. Many of the earlier scholars fell into this same error, and Umar Rida followed them in Mujam Qabail 176, thereby contradicting himself within a single page.A useful note, the vowelling of Judhaymah was recorded in Nihayah 2:248 with the jim vowelled with damma and the dhal with fatha, but this is a scribal corruption.As for their saying "sabana" (we have apostatized), Ibn Athir said, it is said "saba fulan" (so-and-so apostatized) when a person leaves one religion for another, taken from their saying "saba nabu al-baeer" (the camel's tooth emerged) when it comes out, and "sabat al-nujum" (the stars rose) when they emerge from their rising points. The Arabs used to call the Prophet "the Sabi" (the Apostate), because he left the religion of Quraysh for the religion of Islam. And they would call those who entered Islam "musbawn," because they did not pronounce the hamza, so they substituted a waw for the hamza. And they would call the Muslims "the Sabah," without the hamza, as though it were the plural of "al-Sabi" without the hamza, on the pattern of "qadin" and "qudah," or "ghazin" and "ghuzah."