This hadith has been reported by Mansur with the same chain of transwitters and he said:" He should aim at what is according to him correct."
وَحَدَّثَنَاهُ يَحْيَى بْنُ يَحْيَى، أَخْبَرَنَا فُضَيْلُ بْنُ عِيَاضٍ، عَنْ مَنْصُورٍ، بِهَذَا الإِسْنَادِ وَقَالَ
" فَلْيَتَحَرَّ الَّذِي يُرَى أَنَّهُ الصَّوَابُ " .
• Sahih Muslim, 572f
• Sahih Muslim, Vol. 2, Book of Prayers, Hadith 1173
• Sahih Muslim, Book of Prayers, Hadith 1173