Sayyiduna Anas bin Malik (may Allah be pleased with him) narrates: The Prophet Muhammad (peace and blessings be upon him) reached Khaybar at night. Whenever he (peace be upon him) would reach a place at night, he would not attack until morning. Sayyiduna Anas (may Allah be pleased with him) narrates: When morning came, the Jews came out with their spades and baskets. When they saw (the Muslim army), they said: Sayyiduna Muhammad and his army have come. The Prophet Muhammad (peace and blessings be upon him) said: Allah is the Greatest! Khaybar is destroyed. When we descend into the field of a people, then evil is the morning for those who have been warned.
Hadith Referenceصحیح ابن حبان / كتاب السير / 4746
Hadith Gradingفضيلة الشيخ الإمام محمد ناصر الدين الألبانيصحيح: خ - انظر ما قبله.فضيلة الشيخ العلّامة شُعيب الأرناؤوطإسناده صحيح على شرط الشيخين