´It was narrated that Abu Hurairah said:` "The Messenger of Allah (ﷺ) prayed one day then left and said: '0 so-and-so, why don't you improve your prayer? Shouldn't the one who is praying reflection how he prays it for himself? I can see behind me just as I can see in front of me."'
Explanation & Benefits
Hafiz Muhammad Ameen
873. Commentary: It is possible that, according to the author, this is the same person who performed bowing (ruku‘) before joining the row (saff); otherwise, this hadith has no connection with the chapter, unless it is said that performing bowing before joining the row is contrary to the excellence of prayer, and in this hadith, you have commanded to make the prayer excellent. (For the remaining discussion of this hadith, see hadith: 814)
Source: Sunan Nasa'i: Translation and Benefits by Shaykh Hafiz Muhammad Amin Hafizullah, Page: 873