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

'Imran b. al-Husain (Allah be pleased with him) said:

Know well that Allah's Messenger (ﷺ) combined 'Hajj and 'Umra, and nothing was revealed in the Book (to abrogate it), and the Messenger of Allah (ﷺ) too did not forbid us from (combining) them. And whatever a person said was out of his personal opinion.
وَحَدَّثَنَا إِسْحَاقُ بْنُ إِبْرَاهِيمَ، حَدَّثَنَا عِيسَى بْنُ يُونُسَ، حَدَّثَنَا سَعِيدُ بْنُ أَبِي عَرُوبَةَ، عَنْ قَتَادَةَ، عَنْ مُطَرِّفِ بْنِ عَبْدِ اللَّهِ بْنِ الشِّخِّيرِ، عَنْ عِمْرَانَ بْنِ الْحُصَيْنِ، - رضى الله عنه - قَالَ اعْلَمْ أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم جَمَعَ بَيْنَ حَجٍّ وَعُمْرَةٍ ثُمَّ لَمْ يَنْزِلْ فِيهَا كِتَابٌ وَلَمْ يَنْهَنَا عَنْهُمَا رَسُولُ اللَّهِ صلى الله عليه وسلم ‏.‏ قَالَ فِيهَا رَجُلٌ بِرَأْيِهِ مَا شَاءَ‏.‏
Reference : Sahih Muslim 1226f
In-book reference : Book 15, Hadith 186
USC-MSA web (English) reference : Book 7, Hadith 2829
  (deprecated numbering scheme)