Narrated 'Aishah:

"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."

حَدَّثَنَا قُتَيْبَةُ، حَدَّثَنَا اللَّيْثُ، عَنْ يَحْيَى بْنِ سَعِيدٍ، عَنْ عَبْدِ اللَّهِ بْنِ عَامِرِ بْنِ رَبِيعَةَ، أَنَّ عَائِشَةَ، قَالَتْ 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 . قَالَ هَذَا حَدِيثٌ حَسَنٌ صَحِيحٌ .