Sahih Muslim #6230 · The Book of the Merits of the Companions

Sahih MuslimA'isha reported that Allah's Messenger
Sahih Muslim · Book 44 · The Book of the Merits of the Companions
Sahih Muslim · كتاب 44 · كتاب فضائل الصحابة
Were there a pious person from amongst my companions who should keep a watch for me during the nightt? She said: We heard the noise of arms, whereupon Allah's Messenger (ﷺ) said: Who is it? And Sa'd b. Abi Waqqas said: Allah's MesseDger. I have come to serve as your sentinel. 'A'isha said: Allah' s Messenger (ﷺ) slept (such a sound sleep) that I heard the noise of his snoring.
حَدَّثَنَا عَبْدُ اللَّهِ بْنُ مَسْلَمَةَ بْنِ قَعْنَبٍ، حَدَّثَنَا سُلَيْمَانُ بْنُ بِلاَلٍ، عَنْ يَحْيَى بْنِ سَعِيدٍ، عَنْ عَبْدِ اللَّهِ بْنِ عَامِرِ بْنِ رَبِيعَةَ، عَنْ عَائِشَةَ، قَالَتْ أَرِقَ رَسُولُ اللَّهِ صلى الله عليه وسلم ذَاتَ لَيْلَةٍ فَقَالَ لَيْتَ رَجُلاً صَالِحًا مِنْ أَصْحَابِي يَحْرُسُنِي اللَّيْلَةَ ‏.‏ قَالَتْ وَسَمِعْنَا صَوْتَ السِّلاَحِ فَقَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم ‏
"‏ مَنْ هَذَا ‏"‏ ‏.‏ قَالَ سَعْدُ بْنُ أَبِي وَقَّاصٍ يَا رَسُولَ اللَّهِ جِئْتُ أَحْرُسُكَ ‏.‏ قَالَتْ عَائِشَةُ فَنَامَ رَسُولُ اللَّهِ صلى الله عليه وسلم حَتَّى سَمِعْتُ غَطِيطَهُ ‏.‏
Reference : Sahih Muslim 6230In-book reference : Book 44, Hadith 60