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  

I never saw the Prophet ﷺ saying, "Let my parents sacrifice their lives for you," to any man after Saʿd. I heard him saying (to him), "Throw (the arrows)! Let my parents sacrifice their lives for you."  

سَمِعْتُ عَلِيًّا ؓ يَقُولُ مَا رَأَيْتُ النَّبِيَّ ﷺ يُفَدِّي رَجُلاً بَعْدَ سَعْدٍ سَمِعْتُهُ يَقُولُ ارْمِ فِدَاكَ أَبِي وَأُمِّي  

On the day of the battle of Uhud the Prophet ﷺ mentioned for me both his parents (i.e. saying, "Let my parents be sacrificed for you.").  

سَمِعْتُ سَعْدًا يَقُولُ جَمَعَ لِي النَّبِيُّ ﷺ أَبَوَيْهِ يَوْمَ أُحُدٍ