Sahih al-Bukhari 1571
Narrated `Imran:
We performed Hajj-at-Tamattu` in the lifetime of Allah's Messenger (ﷺ) and then the Qur'an was revealed 
(regarding Hajj-at-Tamattu`) and somebody said what he wished (regarding Hajj-at-Tamattu`) 
according his own opinion.
حَدَّثَنَا مُوسَى بْنُ إِسْمَاعِيلَ، حَدَّثَنَا هَمَّامٌ، عَنْ قَتَادَةَ، قَالَ حَدَّثَنِي مُطَرِّفٌ، عَنْ عِمْرَانَ ـ رضى الله عنه ـ قَالَ تَمَتَّعْنَا عَلَى عَهْدِ رَسُولِ اللَّهِ صلى الله عليه وسلم فَنَزَلَ الْقُرْآنُ قَالَ رَجُلٌ بِرَأْيِهِ مَا شَاءَ‏.‏