I asked Anas bin Malik while we were proceeding from Mina to `Arafat, "What do you use to do on this day when you were with Allah's Messenger (ﷺ) ?" Anas said, "Some of us used to recite Talbiya and nobody objected to that, and others used to recite Takbir and nobody objected to that."
Sahih al-Bukhari Book 25, Hadith 140
← Previous Hadith The people doubted whether the Prophet (ﷺ) was observing the fast on the Day of `Arafat, so I sent something for him to drink and he drank it.

Sahih al-Bukhari Book 25, Hadith 139 Next Hadith → `Abdul Malik wrote to Al-Hajjaj that he should not differ from Ibn `Umar during Hajj. On the Day of `Arafat, when the sun declined at midday, Ibn `Umar came along with me and shouted near Al- Hajjaj's cotton (cloth) tent. Al-Hajjaj came Out, wrapping himself with a waist-sheet dyed with safflower, and said, "O Abu `Abdur-Rahman! What is the matter?" He said, If you want to follow the Sunna (the tradition of the Prophet (p.b.u.h) ) then proceed (to `Arafat)." Al-Hajjaj asked, "At this very hour?" Ibn `Umar said, "Yes." He replied, "Please wait for me till I pour some water over my head (i.e. take a bath) and come out." Then Ibn `Umar dismounted and waited till Al-Hajjaj came out. So, he (Al-Hajjaj) walked in between me and my father (Ibn `Umar). I said to him, "If you want to follow the Sunna then deliver a brief sermon and hurry up for the stay at `Arafat." He started looking at `Abdullah (Ibn `Umar) (inquiringly), and when `Abdullah noticed that, he said that he had told the truth.

Sahih al-Bukhari Book 25, Hadith 141