Sayf, in his book, relates through his transmitters:

ʿUmar kept fully apprised of all that Khālid did, and he learned that Khālid had given al-Ashʿath 10,000. He therefore summoned the courier and wrote to Abū ʿUbaydah:

“Detain Khālid, tie him with his own turban, and remove his cap until he tells you from where he paid al-Ashʿath—was it Allah’s property (the public treasury) or his own? If he says it came from booty he had taken, he has confessed to misappropriation; and if he says it was from his private wealth, he has been wasteful. In either case, relieve him of his command and place his province under your control.”

Abū ʿUbaydah carried out the order. Khālid then came to ʿUmar, complained, and said, “I have taken my grievance against you to the Muslims, and, by Allah, O ʿUmar, you have not dealt kindly with me in this matter.”

ʿUmar asked, “From where did all this wealth come?”

He answered, “From the spoils and my allotted shares. Whatever exceeds 60,000 is yours—you may value the goods.”

When the valuation was made, a surplus of 20,000 appeared, and ʿUmar placed it in the Bayt al-Māl. He then said, “O Khālid, by Allah, you are honorable to me and beloved by me, and from today you will never fault me for anything.” (1)

Zayd ibn Aslam reports from his father:

ʿUmar dismissed Khālid, but Abū ʿUbaydah did not inform him until Khālid learned of it from others. Khālid said, “May Allah have mercy on you! What kept you from telling me?” He replied, “I disliked alarming you.”

Juwayriyah ibn Asmāʾ narrates from Nāfiʿ:

Khālid returned from Syria with arrows stained with blood tucked into his turban, and ʿUmar forbade him to do that.

Al-Aṣmaʿī relates from Ibn ʿAwn, from Ibn Sīrīn:

Khālid ibn al-Walīd once entered wearing a silk shirt. ʿUmar asked, “What is this?” He replied, “And what harm is there? Ibn ʿAwf has worn it as well.” (2)