Who was slaughtered by a companion of Muhammad in 632?
Khalid ibn al-Walid Abū Sulaymān Khālid ibn al-Walīd ibn al-Mughīrah al-Makhzūmī (Arabic: أبو سليمان خالد بن الوليد بن المغيرة المخزومي‎ ‎ ‎; 585–642), also known as Sayf ullah al-Maslūl (Arabic: سيف الله المسلول‎ ‎ ; "Drawn Sword of God"), was a companion of Muhammad. He is noted for his military tactics and prowess, commanding the forces of Medina under Muhammad and the forces of his immediate successors of the Rashidun Caliphate, Abu Bakr and Umar ibn Khattab. It was under his military leadership that Arabia, for the first time in history, was united under a single political entity, the Caliphate. Commanding the forces of the nascent Islamic state, Khalid was victorious in over a hundred battles, against the forces of the Byzantine-Roman Empire, Sassanid-Persian Empire, and their allies, in addition to other Arab tribes. His strategic achievements include the conquest of Arabia during the Ridda Wars, Persian Mesopotamia and Roman Syria within several years from 632 to 636. He is also remembered for his decisive victories at Yamamah, Ullais, and Firaz, and his tactical successes at Walaja and Yarmouk.
Ka‘b bin Zaid bin An-Najjar Ka‘b bin Zaid bin An-Najjar was a companion of the Islamic Prophet Muhammad. He was a survivor at the Expedition of Bir Maona. So, Amir bin Tufayl took the help of Banu Salim against the Muslims. Together, they attacked the Muslims. The Muslims fought back, but in the end, all of them were killed except for Ka‘b bin Zaid bin An-Najjar who was carried wounded from among the dead. He later died in the Battle of the Trench.