Sayyiduna Anas (may Allah be pleased with him) said: The Messenger of Allah (peace and blessings be upon him) reached Khaybar at night, but whenever the Prophet (peace and blessings be upon him) came to a people at night, he would not attack before morning. If he (peace and blessings be upon him) heard the call to prayer, he would hold back from attacking; and if they did not pray, he would attack them in the morning. When morning came, he (peace and blessings be upon him) and the Muslims mounted. The people of the town came out with their farming tools. When they saw the Messenger of Allah (peace and blessings be upon him), they said: Muhammad (peace and blessings be upon him) and the army! He (peace and blessings be upon him) said: "Allah is the Greatest! Khaybar is ruined. When we descend upon the courtyard of a people, 'evil is the morning of those who were warned' [Surah al-Saffat: 177]." Sayyiduna Anas (may Allah be pleased with him) said: I was riding behind Sayyiduna Abu Talhah (may Allah be pleased with him), and my feet were touching the feet of the Messenger of Allah (peace and blessings be upon him).
Hadith Referenceالسنن الكبرى للبيهقي / كتاب السير / 18098