Anas bin Malik reported,

The Messenger of Allah ﷺ reached Khaybar in the early morning. Its people had gone out carrying their digging tools, and when they saw him they cried, "Muhammad and his army!" and they rushed back toward the fortress. The Prophet ﷺ raised his hands and said, "Allah is the greatest. Khaybar is ruined. When we descend upon a people's territory, evil is the morning of those who have been warned."

Bukhari 3647

Sahih

حدثنا علي بن عبد الله حدثنا سفيان حدثنا أيوب عن محمد سمعت

أنس بن مالك رضي الله عنه يقول

صبح رسول الله ﷺ خيبر بكرة وقد خرجوا بالمساحي فلما رأوه قالوا محمد والخميس وأحالوا إلى الحصن يسعون فرفع النبي ﷺ يديه وقال الله أكبر خربت خيبر إنا إذا نزلنا بساحة قوم فساء صباح المنذرين

البخاري 3647صحيح
Contents
Reference
Commentary
Ayat
Collection
Sahih Bukhari
Book
Virtues
Chapter
Idolaters asking the Prophet ﷺ to show them a sign, so he showed them the splitting of the moon
Numbering
Darussalam 3647
Bukhari 3647