Amr ibn Aws and AbulSha’tha’ reported that Bujalah said: I was secretary to Jaz’ ibn Mu’awiyah, the uncle of Ahnaf ibn Qays. A letter came to us from Umar one year before his death, saying: Kill every magician, separate the relatives of prohibited degrees from the Magians, and forbid them to murmur (before eating). So we killed three magicians in one day, and separated from a Magian husband his wife of a prohibited degree according to the Book of Allah. He prepared abundant food and called them, and placed the sword on his thigh. They ate (the food) but did not murmur. They threw (on the ground) one or two mule-loads of silver. Umar did not take jizyah from Magians until AbdurRahman ibn Awf witnessed that the Messenger of Allah (ﷺ) had taken jizyah from the Magians of Hajar.
“When the Messenger of Allah (ﷺ) set out for Khaibar, he approached it at night and when he came to a people during the night, he would not attack them until morning. So when the morning came, the Jews came out with their shovels and baskets, then when they saw him, they said: ‘Muhammad! By Allah Muhammad has come with the Khamis (an army).’ So the Messenger of Allah (ﷺ) said: ‘Allahu Akbar! Khaibar is destroyed, for whenever we approach the land of people – then what an evil morning for those who have been warned.'”