The Messenger of Allah ﷺ reached Khaybar in the early morning. The people had come out carrying their spades, and when they saw the Messenger of Allah ﷺ, they cried out, "Muhammad and his army!" The Messenger of Allah ﷺ raised his hands and said, "Allah is the greatest! Khaybar is destroyed. When we descend upon a people's territory, evil is the morning of those who have been warned."
حدثنا عبد الرزاق حدثنا معمر عن أيوب عن ابن سيرين قال سمعت
صبح رسول الله ﷺ خيبر بكرة وقد خرجوا بالمساحي فلما نظروا إلى رسول الله ﷺ قالوا محمد والخميس فرفع رسول الله ﷺ يديه وقال الله أكبر خربت خيبر إنا إذا نزلنا بساحة قوم فساء صباح المنذرين
Its isnad is sahih, and the hadith has already appeared in 11931.12607 M - Abdul-Razzaq narrated to us, Mamar narrated to us from Qatada, from Anas, who said, "When the Prophet ﷺ came to Khaybar, he found them going out to their fields carrying their farming tools. When they saw him with the army, they retreated and went back into their fortress. The Prophet ﷺ said, 'Allah is greatest, Khaybar is destroyed. Whenever we come down upon the courtyard of a people, evil is the morning of those who have been warned.'"Sahih (12607 M). Its isnad is sahih.