The dispute between Ammar and Khalid bin al-Walid (may Allah be pleased with them) and the Prophet's (peace and blessings be upon him) judgement in it

It is narrated from Sayyiduna Khalid bin al-Walid (may Allah be pleased with him) that he said: The Messenger of Allah (peace and blessings be upon him) sent me on an expedition, and Ammar bin Yasir was with me. We came upon some people, among whom a household had mentioned Islam. Ammar said: These people have affirmed the Oneness of Allah (tawhid). But I paid no attention to what he said, and what befell the rest of the people befell them too. The narrator said: Then Ammar began threatening me that if he saw the Messenger of Allah (peace and blessings be upon him), he would certainly tell him. So he came to the Prophet (peace and blessings be upon him) and told him the whole story. When he saw that he (peace and blessings be upon him) was not supporting him (in response to his complaint about me), he turned back weeping. Khalid said: Then he (peace and blessings be upon him) called me and said: "O Khalid! Do not revile Ammar, for whoever reviles Ammar, Allah reviles him; whoever hates Ammar, Allah hates him; and whoever regards Ammar as foolish (and contemptible), Allah makes him foolish (and contemptible)." Khalid said: O Messenger of Allah, pray for forgiveness for me. By Allah, nothing prevented me from answering him except that I considered him foolish. Khalid said: On that day there was nothing I feared more than my having called Ammar bin Yasir foolish.
The chain of this hadith is sahih (authentic), but the two Shaykhs did not record it. Mas'ud bin Sa'd al-Ju'fi and Muhammad bin Fudayl bin Ghazwan also narrated it in the same way from al-Hasan bin Ubaydullah al-Nakha'i.

This is the narration of Mas'ud bin Sa'd from Sayyiduna Khalid bin al-Walid (may Allah be pleased with him) (its content is like the previous hadith).

It is narrated from Sayyiduna Khalid bin al-Walid (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) sent me on a military expedition, and there we came upon those people. Ammar bin Yasir said: These people have sought protection from us through the Oneness of Allah (tawhid). But I paid no attention to what he said. And he mentioned a hadith similar to it.

It is narrated from Sayyiduna Khalid bin al-Walid (may Allah be pleased with him) that he said: Some words (of bitterness) passed between me and Ammar bin Yasir (may Allah be pleased with him), so I complained about him to the Messenger of Allah (peace and blessings be upon him). The Messenger of Allah (peace and blessings be upon him) said: "O Khalid! Whoever reviles Ammar, Allah reviles him; whoever shows enmity to Ammar, Allah shows enmity to him; and whoever belittles Ammar, Allah belittles him."
Imam al-Hakim said: I previously mentioned the narration of Abu Dawud from Shu'bah as being among the singular narrations of Abu Dawud, but then I also found this narration by way of Amr bin Marzuq.

Alqamah narrates from Sayyiduna Khalid bin al-Walid (may Allah be pleased with him) that he said: Some words passed between me and Ammar bin Yasir, and I was harsh with him. So Ammar went off to the Prophet (peace and blessings be upon him) to complain. Meanwhile Khalid also came while Ammar was complaining, and he began to be even harsher with Ammar, and his harshness only kept increasing, while the Prophet (peace and blessings be upon him) remained silent. Then Ammar wept and said: O Messenger of Allah! Do you not see him (being harsh with me)? The narrator said: Then the Prophet (peace and blessings be upon him) raised his blessed head and said: "Whoever shows enmity to Ammar, Allah will show enmity to him; and whoever hates Ammar, Allah will hate him." Khalid said: Then I went out, and nothing was dearer to me than Ammar's being pleased. So I met him, and he became pleased (with me).
The chain of this hadith is sahih (authentic) and on the condition of the two Shaykhs (Bukhari and Muslim), because both of them agreed upon al-Awwam bin Hawshab and Alqamah; although Shu'bah is a greater hafiz than him, as he said in its chain: "Salamah bin Kuhayl, from Muhammad bin Abd al-Rahman bin Yazid, from his father, from al-Ashtar". And both chains are sahih (authentic).

It is narrated from al-Ashtar that Sayyiduna Khalid bin al-Walid (may Allah be pleased with him) told me (without my asking him): No day ever weighed more heavily on me than the matter of Ammar, when the Messenger of Allah (peace and blessings be upon him) sent me on an expedition with some of his Companions and appointed me as their commander, and Ammar was also among that party. We came upon a people among whom there was a household of Muslims. Ammar and some other Muslims spoke to me about them and said: Let them go. I said: No, by Allah! I will not do so until the Messenger of Allah (peace and blessings be upon him) sees them and forms his opinion about them. At this Ammar became angry with me. When I returned and sought permission to come into the presence of the Messenger of Allah (peace and blessings be upon him), he (peace and blessings be upon him) was asking me about what had happened and I was reporting to him. Meanwhile Ammar also asked permission, and he (peace and blessings be upon him) gave him permission. Ammar entered and said: O Messenger of Allah! Have you not seen what Khalid did? So I said (in a fit of anger): O Messenger of Allah! By Allah, were it not for regard for your gathering, this son of Sumayyah would not revile me. Then the Messenger of Allah (peace and blessings be upon him) said: "O Ammar! Go outside." Ammar went out weeping, saying that the Messenger of Allah (peace and blessings be upon him) had not supported him against Khalid. Then the Messenger of Allah (peace and blessings be upon him) said to me: "Why did you not answer the man?" I said: Nothing prevented me from answering him except my contempt for him (that is, I did not consider him my equal). Then the Messenger of Allah (peace and blessings be upon him) became angry and said: "Indeed, whoever hates Ammar, Allah will hate him; whoever reviles Ammar, Allah will revile him; and whoever belittles Ammar, Allah will belittle him." Then I left the presence of the Messenger of Allah (peace and blessings be upon him) and kept asking Ammar for pardon until he prayed for forgiveness for me.