What was the reason for 'Umar's removal of Khalid ibn al-Walid and his appointment of Abu 'Ubaydah?

The questioner: We read in some books statements that are insinuated against Islam, such as what is said about the removal of Khalid ibn al-Walid (may Allah be pleased with him) from leading the army. It would be desirable if you, O Shaykh, would warn the people against those claims that cast doubt on Islam and on Khalid ibn al-Walid?
The answer: What is known in this matter is that his removal by 'Umar was for a political matter that he (may Allah be pleased with him) saw, and he saw replacing him with Abu 'Ubaydah ibn al-Jarrah for a matter he saw as sufficient for the benefit of the Muslims.
And some of the scholars of knowledge said: The reason for that is that 'Umar was (may Allah be pleased with him) strong in all matters, and Khalid was also strong in some matters, so it was fitting that Abu 'Ubaydah be the commander of 'Umar; because he was gentle and kind, not like Khalid in his severity, so that the matter would be balanced. Abu 'Ubaydah, with his gentleness, would be in contrast to the severity of 'Umar (may Allah be pleased with him), and Khalid, with his strength, would be in contrast to the gentleness of al-Siddiq (may Allah be pleased with him), so the matter was balanced. This is a sound statement and is not far-fetched.
The conclusion is: 'Umar (may Allah be pleased with him) only removed him for a political matter for the benefit of the Muslims, either what we mentioned or something else, and the well-known is what we mentioned, and success is from Allah.
The presenter: May Allah reward you with good. So, one should not pay attention to those statements that are insinuated in this...
The Shaykh: Everything that contradicts that, in the form of bad suspicion, is all invalid. Everything that is said out of bad suspicion regarding 'Umar or regarding Khalid is all invalid.
The presenter: May Allah reward you with good.