Sahih Bukhari
Pilgrimmage (Hajj)
Volume: 002 / Book Number: 026 / Hadith Number: 642
Narrated 'Imran:
We performed Hajj-at-Tamattu' in the lifetime of Allah's Apostle and then the Quran was revealed (regarding Hajj-at-Tamattu') and somebody said what he wished (regarding Hajj-at-Tamattu') according his own opinion.