question #1 Sahih Muslim 1178c, Book 15, Hadith 6 : What is the significance of delivering an address at ‘Arafat in Islamic tradition?

This hadith has been narrated on the authority of ‘Amr b. Dinar with the same chain of transmitters, but none of them (the narrators) made a mention that he (the Holy Prophet) was delivering address at ‘Arafat except Shu’ba.