It is narrated from Sayyiduna Amr bin al-As (may Allah be pleased with him), who narrated it directly: I set out towards the Messenger of Allah (peace and blessings be upon him) intending (to accept Islam), and on the way I met Khalid bin al-Walid. This was a little before the Conquest of Makkah, and he was coming from Makkah. I asked: O Abu Sulayman, where are you heading? He said: By Allah, the path has become clear; that man (Muhammad, peace and blessings be upon him) is certainly the Prophet of Allah. I am going to accept Islam; how much longer (will I stay away from the truth)? He said: Then we came to the Messenger of Allah (peace and blessings be upon him) in Madinah. Khalid bin al-Walid stepped forward, accepted Islam and pledged allegiance; then I drew near, pledged allegiance and returned.

Wahshi bin Harb narrates from his grandfather that Sayyiduna Abu Bakr al-Siddiq (may Allah be pleased with him) dispatched Khalid bin al-Walid (may Allah be pleased with him) to fight the apostates. He was spoken to about this, but he refused to recall Khalid (may Allah be pleased with him) and said: I heard the Messenger of Allah (peace and blessings be upon him) mention Khalid bin al-Walid; he (peace and blessings be upon him) said: "He is an excellent servant of Allah, an excellent brother of the tribe, and one of the swords of Allah."