Ibrahim bin Suwayd reported,

Alqama prayed five rakahs. It was said to him about it, and he asked, "Did I do that?"I gestured with my head, "Yes."He said, "And you too, one-eyed one?"I replied, "Yes."So he performed two prostrations, then narrated to us from Abdullah, from the Prophet ﷺ, that he once prayed five rakahs. The people whispered to one another, then asked him, "Has the prayer been increased?"He said, "No."They informed him of what had happened, so he folded his leg and performed two prostrations, then said, "I am only a human being. I forget just as you forget."

Nasai 1257

Sahih

أخبرنا محمد بن رافع قال حدثني يحيى بن آدم قال حدثنا مفضل بن مهلهل عن الحسن بن عبيد الله

عن إبراهيم بن سويد قال

صلى علقمة خمسا فقيل له فقال ما فعلت قلت برأسي بلى قال وأنت يا أعور فقلت نعم فسجد سجدتين ثم حدثنا عن عبد الله عن النبي ﷺ أنه صلى خمسا فوشوش القوم بعضهم إلى بعض فقالوا له أزيد في الصلاة قال لا فأخبروه فثنى رجله فسجد سجدتين ثم قال إنما أنا بشر أنسى كما تنسون

النسائي 1257صحيح
Contents
Reference
Commentary
Ayat
Collection
Sunan Nasai Sughra
Book
Forgetfulness
Chapter
What should be done by one who prays five
Numbering
Darussalam 1257
Nasai 1257