Sahl bin Hanzaliya reported,

They marched with the Messenger of Allah ﷺ on the day of Hunayn, pressing on at length until evening came and the time for prayer arrived in the presence of the Messenger of Allah ﷺ.A horseman came and said, "Messenger of Allah, I rode out ahead of you until I climbed such-and-such a mountain, and there I saw the tribe of Hawazin gathered in their entirety, with their womenfolk, livestock, and sheep, all assembled at Hunayn."The Messenger of Allah ﷺ smiled and said, "That will be the spoils of the Muslims tomorrow, Allah willing."Then he said, "Who will keep watch over us tonight?"Anas bin Abu Marthad al-Ghanawi said, "I will, Messenger of Allah."The Prophet ﷺ said, "Then mount up."So he mounted his horse and came to the Messenger of Allah ﷺ, who said to him, "Head toward this mountain pass and station yourself at its summit, and let us not be taken by surprise from your direction tonight."When morning came, the Messenger of Allah ﷺ went out to his place of prayer, performed two units of prayer, then said, "Have you seen any sign of your horseman?"They said, "Messenger of Allah, we have seen no sign of him."The call to prayer was given, and as the Messenger of Allah ﷺ was praying, he kept glancing toward the pass. When he completed his prayer and gave the closing salutation, he said, "Rejoice, for your horseman has come!"We began looking through the gaps in the trees of the pass, and there he was, having arrived. He stopped before the Messenger of Allah ﷺ, greeted him, and said, "I went off until I reached the top of this pass, where the Messenger of Allah ﷺ had ordered me. When morning came, I surveyed both passes and looked carefully but saw no one."The Messenger of Allah ﷺ asked him, "Did you dismount during the night?"He replied, "No, except to pray or relieve myself."The Messenger of Allah ﷺ said to him, "You have secured Paradise for yourself. It will not matter if you do nothing more after this."

عن سهل بن الحنظلية

أنهم ساروا مع رسول الله ﷺ يوم حنين، فأطنبوا السير، حتى كانت عشية فحضرت صلاة عند رسول الله ﷺ، فجاء رجل فارس فقال: يا رسول الله! إني انطلقت بين أيديكم حتى طلعت جبل كذا وكذا، فإذا أنا بهوازن على بكرة آبائهم- بظعنهم ونعمهم وشائهم- اجتمعوا إلى حنين فتبسم رسول الله ﷺ وقال: تلك غنيمة المسلمين غدا إن شاء الله ثم قال: من يحرسنا الليلة؟ قال أنس بن أبي مرثد الغنوي: أنا يا رسول الله! قال: فاركب فركب فرسا له فجاء إلى رسول الله ﷺ فقال له رسول الله ﷺ: استقبل هذا الشعب حتى تكون في أعلاه ولا نغرن من قبلك الليلة فلما أصبحنا خرج رسول الله ﷺ إلى مصلاه فركع ركعتين ثم قال: هل أحسستم فارسكم قالوا: يا رسول الله ما أحسسناه! فثوب بالصلاة فجعل رسول الله ﷺ- وهو يصلي- يلتفت إلى الشعب حتى إذا قضى صلاته وسلم قال: أبشروا فقد جاءكم فارسكم! فجعلنا ننظر إلى خلال الشجر في الشعب فإذا هو قد جاء حتى وقف على رسول الله ﷺ فسلم فقال: إني انطلقت حتى كنت في أعلى هذا الشعب حيث أمرني رسول الله ﷺ فلما أصبحت اطلعت الشعبين كليهما فنظرت فلم أر أحدا! فقال له رسول الله ﷺ: هل نزلت الليلة؟ قال: لا، إلا مصليا أو قاضيا حاجة، فقال له رسول الله ﷺ: قد أوجبت فلا عليك أن لا تعمل بعدها.