It is narrated from Qays bin Abi Hazim (may Allah have mercy on him) that the Messenger of Allah (peace and blessings be upon him) sent Sayyiduna Khalid bin al-Walid (may Allah be pleased with him) to some people of the tribe of Khath'am. They tried to protect themselves by prostrating, showing their Islam, but Khalid (may Allah be pleased with him) killed them. So the Messenger of Allah (peace and blessings be upon him) paid their heirs half the blood money, then said: "I am free of every Muslim who lives among the polytheists; the fires of the two should not be visible to each other."
Hadith Referenceالمعجم الكبير للطبراني / باب الخاء / 3821
Qays bin Abi Hazim (may Allah have mercy on him) said: On the day of the Battle of Yarmuk I saw Sayyiduna Khalid bin al-Walid (may Allah be pleased with him) shooting arrows between two targets, and with him were some men from among the Companions of the Prophet (peace and blessings be upon him). He said: "We have been commanded to teach our children archery and the Qur'an."
Hadith Referenceالمعجم الكبير للطبراني / باب الخاء / 3822