Anas bin Malik reported,

Whenever the Messenger of Allah ﷺ launched a campaign against a people, he would not attack them until morning. If he heard the call to prayer, he would hold back, but if he heard no call to prayer, he would attack after dawn broke. So we descended upon Khaybar by night.In another wording, the Prophet ﷺ set out for Khaybar and arrived there by night. Whenever he came upon a people at night, he would not attack them until morning. When morning came, the Jews went out with their shovels and baskets. When they saw him, they cried out, "Muhammad, by Allah! Muhammad and his army!"The Prophet ﷺ said, "Allah is the greatest! Khaybar is ruined. When we descend upon the courtyard of a people, evil is the morning of those who have been warned."

عن أنس قال

كان رسول الله ﷺ إذا غزا قوما لم يغر عليهم حتى يصبح، فإن سمع أذانا أمسك، وإن لم يسمع أذانا أغار بعدما يصبح، فنزلنا خيبر ليلا. وفي لفظ: أن النبي ﷺ خرج إلى خيبر، فجاءها ليلا، وكان إذا جاء قوما بليل لا يغير عليهم حتى يصبح، فلما أصبح خرجت يهود بمساحيهم ومكاتلهم، فلما رأوه قالوا: محمد والله، محمد والخميس! فقال النبي ﷺ: الله أكبر! خربت خيبر، إنا إذا نزلنا بساحة قوم فساء صباح المنذرين.