question #1 Sahih al-Bukhari 1571, Book 25, Hadith 57 : What is Hajj-at-Tamattu` and how was it practiced during the lifetime of the Prophet Muhammad (ﷺ)?

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.