كتاب الْمَسَاجِدِ وَمَوَاضِعِ الصَّلاَةِ
5  
The Book of Mosques and Places of Prayer
(19)
Chapter: As-Sahw (forgetfulness) in prayer and prostrating to compensate for it
(19)
باب السَّهْوِ فِي الصَّلاَةِ وَالسُّجُودِ لَهُ ‏
Sahih Muslim 572 i

Alqama reported:

He (the Holy Prophet) had led them five rak'ahs in prayer.
وَحَدَّثَنَا ابْنُ نُمَيْرٍ، حَدَّثَنَا ابْنُ إِدْرِيسَ، عَنِ الْحَسَنِ بْنِ عُبَيْدِ اللَّهِ، عَنْ إِبْرَاهِيمَ، عَنْ عَلْقَمَةَ، أَنَّهُ صَلَّى بِهِمْ خَمْسًا ‏.‏
Reference : Sahih Muslim 572i
In-book reference : Book 5, Hadith 120
USC-MSA web (English) reference : Book 4, Hadith 1176
  (deprecated numbering scheme)