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 e

This hadith has been narrated by Mansur with the same chain of transmitters and said:

" He should aim at correctness and that is right."
حَدَّثَنَاهُ مُحَمَّدُ بْنُ الْمُثَنَّى، حَدَّثَنَا مُحَمَّدُ بْنُ جَعْفَرٍ، حَدَّثَنَا شُعْبَةُ، عَنْ مَنْصُورٍ، بِهَذَا الإِسْنَادِ وَقَالَ ‏ "‏ فَلْيَتَحَرَّ أَقْرَبَ ذَلِكَ إِلَى الصَّوَابِ ‏"‏ ‏.‏
Reference : Sahih Muslim 572e
In-book reference : Book 5, Hadith 116
USC-MSA web (English) reference : Book 4, Hadith 1172
  (deprecated numbering scheme)