Sahih al-Bukhari 1517
In-book no 1517حَدَّثَنَا 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.
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.