question #3 Sahih al-Bukhari 7269, Book 96, Hadith 2 : What role does the Tashah-hud play in Islamic practices and speeches?

That he heard `Umar speaking while standing on the pulpit of the Prophet (ﷺ) in the morning (following
the death of the Prophet), when the people had sworn allegiance to Abu Bakr. He said the Tashah-hud
before Abu Bakr, and said, “Amma Ba’du (then after) Allah has chosen for his Apostle what is with
Him (Paradise) rather than what is with you (the world). This is that Book (Qur’an) with which Allah
guided your Apostle, so stick to it, for then you will be guided on the right path as Allah guided His
Apostle with it.”