The Prophet ﷺ was vigilant one night and when he reached Medina, he said, "Would that a pious man from my companions guard me tonight!" Suddenly we heard the clatter of arms. He said, "Who is that? " He (The new comer) replied, " I am Saʿd bin Abi Waqqas and have come to guard you." So, the Prophet ﷺ slept (that night).  

سَمِعْتُ عَائِشَةَ ؓ تَقُولُ كَانَ النَّبِيُّ ﷺ سَهِرَ فَلَمَّا قَدِمَ الْمَدِينَةَ قَالَ لَيْتَ رَجُلاً مِنْ أَصْحَابِي صَالِحًا يَحْرُسُنِي اللَّيْلَةَ إِذْ سَمِعْنَا صَوْتَ سِلاَحٍ فَقَالَ مَنْ هَذَا فَقَالَ أَنَا سَعْدُ بْنُ أَبِي وَقَّاصٍ جِئْتُ لأَحْرُسَكَ وَنَامَ النَّبِيُّ ﷺ  

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 Messenger of Allah 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.  

أَرِقَ رَسُولُ اللَّهِ ﷺ ذَاتَ لَيْلَةٍ فَقَالَ لَيْتَ رَجُلاً صَالِحًا مِنْ أَصْحَابِي يَحْرُسُنِي اللَّيْلَةَ قَالَتْ وَسَمِعْنَا صَوْتَ السِّلاَحِ فَقَالَ رَسُولُ اللَّهِ ﷺ مَنْ هَذَا قَالَ سَعْدُ بْنُ أَبِي وَقَّاصٍ يَا رَسُولَ اللَّهِ جِئْتُ أَحْرُسُكَ قَالَتْ عَائِشَةُ فَنَامَ رَسُولُ اللَّهِ ﷺ حَتَّى سَمِعْتُ غَطِيطَهُ  

Were there a pious person from amongst my Companions who should keep a watch for me durin. the night? She (A'isha) reported: We were in this state that we heard the clanging noise of arms. lie (the Holy Prophet) said: Who is it? He said: This is Sa'd b. Abi Waqqas. Messenger of Allah ﷺ said to him: What brings you here? Thereupon he said: I harboured fear (lest any harm should come to) Messenger of Allah ﷺ, so I came to serve as your sentinel. Messenger of Allah ﷺ invoked blessings upon him. He then slept. This hadith has been transmitted on the authority of Ibn Rumh with a slight variation of wording.  

سَهِرَ رَسُولُ اللَّهِ ﷺ مَقْدَمَهُ الْمَدِينَةَ لَيْلَةً فَقَالَ لَيْتَ رَجُلاً صَالِحًا مِنْ أَصْحَابِي يَحْرُسُنِي اللَّيْلَةَ قَالَتْ فَبَيْنَا نَحْنُ كَذَلِكَ سَمِعْنَا خَشْخَشَةَ سِلاَحٍ فَقَالَ مَنْ هَذَا قَالَ سَعْدُ بْنُ أَبِي وَقَّاصٍ فَقَالَ رَسُولُ اللَّهِ ﷺ مَا جَاءَ بِكَ قَالَ وَقَعَ فِي نَفْسِي خَوْفٌ عَلَى رَسُولِ اللَّهِ ﷺ فَجِئْتُ أَحْرُسُهُ فَدَعَا لَهُ رَسُولُ اللَّهِ ﷺ ثُمَّ نَامَ وَفِي رِوَايَةِ ابْنِ رُمْحٍ فَقُلْنَا مَنْ هَذَا  

"The Messenger of Allah ﷺ did not sleep one night upon arriving in Al-Madinah. So he said: 'If only a righteous man would guard me tonight.'" She said: "So we were like that, when we heard the clanging of weapons. He said: 'Who is this?' So he said: 'Sa'd bin Abi Waqqas.' So the Messenger of Allah ﷺ said: 'What has brought you?' Sa'd said: 'Fear for the Messenger of Allah ﷺ came upon me, so I came to protect him.' So the Messenger of Allah ﷺ supplicated for him, then slept."  

سَهِرَ رَسُولُ اللَّهِ ﷺ مَقْدَمَهُ الْمَدِينَةَ لَيْلَةً قَالَ لَيْتَ رَجُلاً صَالِحًا يَحْرُسُنِي اللَّيْلَةَ قَالَتْ فَبَيْنَا نَحْنُ كَذَلِكَ إِذْ سَمِعْنَا خَشْخَشَةَ السِّلاَحِ فَقَالَ مَنْ هَذَا فَقَالَ سَعْدُ بْنُ أَبِي وَقَّاصٍ فَقَالَ لَهُ رَسُولُ اللَّهِ ﷺ مَا جَاءَ بِكَ فَقَالَ سَعْدٌ وَقَعَ فِي نَفْسِي خَوْفٌ عَلَى رَسُولِ اللَّهِ ﷺ فَجِئْتُ أَحْرُسُهُ فَدَعَا لَهُ رَسُولُ اللَّهِ ﷺ ثُمَّ نَامَ هَذَا حَدِيثٌ حَسَنٌ صَحِيحٌ