كتاب الحج
15  
The Book of Pilgrimage
(23)
Chapter: The Permissibilty of Tamattu'
(23)
باب جَوَازِ التَّمَتُّعِ
Sahih Muslim 1226 b

This hadith been narrated on the authority of Jurairi with the same chain of transmitters, and Ibn Hatim said in his narration:

" A person said according to his personal opinion, and it was Umar."
وَحَدَّثَنَاهُ إِسْحَاقُ بْنُ إِبْرَاهِيمَ، وَمُحَمَّدُ بْنُ حَاتِمٍ، كِلاَهُمَا عَنْ وَكِيعٍ، حَدَّثَنَا سُفْيَانُ، عَنِ الْجُرَيْرِيِّ، فِي هَذَا الإِسْنَادِ وَقَالَ ابْنُ حَاتِمٍ فِي رِوَايَتِهِ ارْتَأَى رَجُلٌ بِرَأْيِهِ مَا شَاءَ ‏.‏ يَعْنِي عُمَرَ ‏.‏
Reference : Sahih Muslim 1226b
In-book reference : Book 15, Hadith 182
USC-MSA web (English) reference : Book 7, Hadith 2825
  (deprecated numbering scheme)