Anas bin Malik reported,

The Prophet ﷺ reached Khaybar early in the morning, and the people had gone out with their digging tools. When they saw him, they cried out, "Muhammad and the army! Muhammad and the army!" Then they turned and ran toward their fortress.The Messenger of Allah ﷺ raised his hands and said "Allahu Akbar" three times, then said, "Khaybar is destroyed. When we descend upon a people's territory, evil is the morning of those who have been warned."We caught some donkeys that had wandered out of the village and cooked them. The Messenger of Allah ﷺ then said, "Allah and His Messenger forbid you from the meat of domesticated donkeys, for it is filth from the work of Satan."

عن أنس قال

صبح النبي ﷺ خيبر بكرة، وقد خرجوا بالمساحي، فلما نظروا إليه قالوا: محمد والخميس، محمد والخميس، ثم أحالوا يسعون إلى الحصن، ورفع رسول الله ﷺ يديه، ثم كبر ثلاثا، ثم قال: خربت خيبر إنا إذا نزلنا بساحة قوم فساء صباح المنذرين فأصبنا حمرا خارجة من القرية، فاطبخناها، فقال رسول الله ﷺ: إن الله عز وجل ورسوله ينهيانكم عن الحمر الأهلية، فإنها رجس من عمل الشيطان.