First Hadith:
Bukhari :: Book 5 :: Volume 59 :: Hadith 628 & Bukhari :: Book 9 :: Volume 89 :: Hadith 299
Military Expeditions led by the Prophet (PBUH) (Al-Maghaazi)
Narrated Salim’s father:

The Prophet sent Khalid bin Al-Walid to the tribe of Jadhima and Khalid invited them to Islam but they could not express themselves by saying, “Aslamna (i.e. we have embraced Islam),” but they started saying “Saba’na! Saba’na (i.e. we have come out of one religion to another).” Khalid kept on killing (some of) them and taking (some of) them as captives and gave every one of us his Captive. When there came the day then Khalid ordered that each man (i.e. Muslim soldier) should kill his captive, I said, “By Allah, I will not kill my captive, and none of my companions will kill his captive.” When we reached the Prophet, we mentioned to him the whole story. On that, the Prophet raised both his hands and said twice, “O Allah! I am free from what Khalid has done.”

Second Hadith:
Tabaqatul Kubra by Ibn Sa’ad Vol.2 Page 147
“When Khalid had returned from destroying the ‘Uzzat (idol), The prophet (PBUH) sent him to Bani Judhaima calling them towards islam and did not send him to fight, Khalid left Makka with 350 men made up of Muhajireen (imigrants), Ansar (helpers), and the tribe of bani salim. When khalid reached his destination he asked (the bani Judhaima) what are you?
They answered ‘we are muslims, we believed in Muhammad (PBUH) and we built the mosques in our yards and called made the azaan (call to prayer) in them’ Khalid asked ‘then why are you armed with weapons?’ they answered ‘There’s enmity between us and one of the arab tribes, and we were afraid you were them so we armed ourselves’ khalid said ‘Put down your weapons and surrender yourselves’ they surrendered themselves and khalid gave a prisoner to every one of his army men. When day break approached, khalid called out ‘whoever has a prisoner with him let him get ready and kill his prisoner’. Bani Salim killed the prisoners they had but the ansaar and muhajireen (helpers and immigrants) refused and set free their prisoners. When the news reached the prophet (PBUH) , he lifted his hands up to the sky and said ‘O Allah! I am free from what Khalid has done.’”

Third Hadith:
Kanzul Ummal Vol.13 page 222 Hadith #36674
Narrated a bin al-akwa’:
“When khalid bin walid returned to the prophet (PBUH) after what he did with the bani Judhaima, he was critized by Abdulrahman ibn Auf; he said ‘Oh Khalid, you took upon yourself the tradition of Jahiliyah (customs practiced in the era of ignorance before islam) and you killed them out of revenge for your uncle al-fakih, may Allah fight you’ Umar ibn al-khattab also assisted Abdulrahman in this matter.
Khalid: ‘I only killed them for killing your father’
Abdulrahman: ‘you lie, by Allah I killed the killer of my father with my own hands, and Uthman ibn Affan is my witness’ He turned to Uthman and said ‘I ask you by Allah, do you know that I killed the killer of my father’
Uthman: ‘By Allah yes’
Abdulrahman said Woe to you oh Khalid, even if I didn’t kill my father’s killer, do you then kill Muslims for what they did to my father in the era of ignorance?’
Khalid:’And who informed you they were muslims?’
Abdulrahman: ‘everyone from your contingent are explaining that you found they built mosques and testified their islam and you lifted the sword upon them.
Khalid: ‘An order from the prophet (PBUH) has reached me that I should kill them so I followed his order’
Abdulrahman: ‘you lie against the messenger of Allah’. Abdulrahman turned against Khalid, and the messenger of Allah (PBUH) turned away from khalid and became angered with him”

Fourth Hadith:
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Al-mustadrak :: remembering the merits of Ammar bin Yair (ra) Vol.13 page 133 (online version)
Narrated al-ashtar:
“I heard khalid bn al-walid say; The messenger of Allah (PBUH) sent me with a contingent and Ammar bin Yasir was with me. We encountered and killed a people, among them were a muslim family. Ammar said to me ‘these are people who testified to Allah’s oneness’, but I didn’t pay attention to him and did with them as the others (killed them) and Ammar persisted in promising me that he will inform the messenger about what I did.
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few more historical issues about your so called “Saif-ullah: sword of Allah”
- The Sword of Allah (Saif-Allah) was only one and that was declared in Uhud. Saif-Allah is Laqab for Hazrat Ali (A.S): and you have not even mentioned name of islam’s & Prophet’s (PBUH) best companion in your all these Audio recordings, this makes your all of the work until now questionable, that you have one sided view (your view)

- He (Khalid bin waleed) murdered Maalik bin Navera, slashed the Quran into two, raped Maalik bin Naver’s wife after he had professed Islam, even after the shahdat of Rasool Allah.

- He never lost a battle because he would take a fully equipped and trained army against ill equipped villagers. He never lost because it was like a giant battling a child. His army was trained while his opponents were just villagers who didn’t want to pay taxes anymore. The battles were basically slaughters. That’s why he never lost anything. (keeping in mind, as it is been said, he (Khaild bin waleed) fled from the battle of Hunain)

Maybe you need to read again the history when this so called ‘Sword of Allah’ was the leader of an army and they came running back instead of fighting and attaining martyrdom. And when they came back to Medina people greeted them with the words of “O fugitives! Why did you run away from jihad?” and by throwing dust on their heads and faces and after this the members of the army had confined themselves to their houses and if they came out they were pointed at and said “He is one of those person who ran away from jihad” (References: Seerah i Ibn Hisham vol II pp 382 and Seerah i Halabi vol II p79)

- He (Khalid bin waleed) never lead any (ANY) battle from the front, always hid himself in the qalb-e-lashkar, the safest part.
Qalb-e-lashkar (The center of the formation). supported by massed infantry; covered from all sides is called safest part of battle formation.

- Khalid bin Waleed being one of the oppressors and the attackers which were involved in the tragedy of Bibi Fatima [sa]

- Khalid bin waleed intially used his so called saif-allah against Muslims, at that time saif of Ali (AS) was defending Islam. The saif Khalid then remained in its sheath till the departure of the Holy Prophet (PBUH) and he did not bare it in any ghazwa or siria. After the Holy Prophet (PBUH) Khalid bin waleed again bared his saif against Muslims. How can Holy Prophet (PBUH) can name such guy Saifullah Who is accusing Allah and His Prophet…?

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There are plenty of things to say and write but I think this is more than enough to make you think before writing again… its a big responsibility when you want to write publicly… better understand that… hope you’ll do your knowledgeable research before writing next time. or else leave this “writing” idea and do something where you dont infect others…

Allah bless us with the light of knowledge, Aameen