`Abdul-Malik bin Marwan wrote to Al-Hajjaj that he should follow `Abdullah bin `Umar in all the ceremonies of Hajj. So when it was the Day of `Arafat (9th of Dhul-Hijja), and after the sun has deviated or has declined from the middle of the sky, I and Ibn `Umar came and he shouted near the cotton (cloth) tent of Al-Hajjaj, "Where is he?" Al-Hajjaj came out. Ibn `Umar said, "Let us proceed (to `Arafat)." Al-Hajjaj asked, "Just now?" Ibn `Umar replied, "Yes." Al-Hajjaj said, "Wait for me till I pour water on me (i.e. take a bath)." So, Ibn `Umar dismounted (and waited) till Al-Hajjaj came out. He was walking between me and my father. I informed Al-Hajjaj, "If you want to follow the Sunna today, then you should shorten the sermon and then hurry up for the stay (at `Arafat)." Ibn `Umar said, "He (Salim) has spoken the truth."
Sahih al-Bukhari Book 25, Hadith 144
← Previous Hadith Salim said, "In the year when Al-Hajjaj bin Yusuf attacked Ibn Az-Zubair, the former asked 'Abdullah (Ibn 'Umar) what to do during the stay on the Day of 'Arafa (9th of Dhul-Hajjah). I said to him, "If you want to follow the Sunna (the legal way of the Prophet (ﷺ)) you should offer the Salat just after midday on the Day of the 'Arafa. 'Abdullah bin 'Umar said, 'He (Salim) has spoken the truth.' " They (the Companions of the Prophet (ﷺ)) used to offer the Zuhr and Asr prayer together according to the Sunna, I asked Salim, "Did Allah's Messenger (ﷺ) do that ?" Salim said, "And in doing that do you (people) follow anything else except his (ﷺ) Sunna?"

Sahih al-Bukhari Book 25, Hadith 143 Next Hadith → My father said, "(Before Islam) I was looking for my camel .." The same narration is told by a different sub-narrator. Jubair bin Mut`im said, "My camel was lost and I went out in search of it on the day of `Arafat, and I saw the Prophet (ﷺ) standing in `Arafat. I said to myself: By Allah he is from the Hums (literally: strictly religious, Quraish were called so, as they used to say, 'We are the people of Allah we shall not go out of the sanctuary). What has brought him here?"

Sahih al-Bukhari Book 25, Hadith 145