Sahih Muslim
The Book of Mosques and Places of Prayer
Hadith #115
5.115
حَدَّثَنَاهُ إِسْحَاقُ بْنُ إِبْرَاهِيمَ، أَخْبَرَنَا عُبَيْدُ بْنُ سَعِيدٍ الأُمَوِيُّ، حَدَّثَنَا سُفْيَانُ، عَنْ مَنْصُورٍ، بِهَذَا الإِسْنَادِ وَقَالَ " فَلْيَتَحَرَّ الصَّوَابَ " .
This hadith has been narrated by Mansur with the same chain of transmitters with the words:He should aim at what is correct and complete