Maliks Muwatta Book 20, Hadith Number 203.

Section : Doing the Prayer in the House, Shortening the Prayer, and Hastening the Khutba at Arafa.

Yahya related to me from Malik from Ibn Shihab that Salim ibn Abdullah said, ”Abd al-Malik ibn Marwan wrote to al-Hajjaj ibn Yusuf telling him not to disagree with Abdullah ibn Umar about anything to do with the hajj. Then, when the day of Arafa came Abdullah ibn Umar went to him just after noon, and I went with him. He called out to him outside his tent, ‘Where is this man?’ and al-Hajjaj came out to him, wearing a blanket dyed with safflower, and said to him, ‘What’s up with you, Abu Abd ar-Rahman?’ He said, ‘Hurry up, if you want to follow the sunna.’ Al-Hajjaj said, ‘At this hour?’ and he said, ‘Yes.’ Al-Hajjaj said, ‘Wait until I have poured some water over myself, and then I will come out.’ So Abdullah dismounted and waited until al-Hajjaj came out. He passed between me and my father and I said to him, ‘If you want to accord with the sunna today, then make the khutba short, do not delay the prayer and do the prayer quickly.’ Then he began looking at Abdullah ibn Umar to see if he would say the same thing, and when Abdullah saw that, he said, ‘What Salim is saying is true.'”