Musnad Ahmad 3351

It was narrated that 'Abdullah bin ‘Abbas (رضي الله عنه) said: al-Fadl was seated behind the Messenger of Allah (ﷺ) on his mount when a woman from Khath'am came and asked him a question, and al-Fadl started looking at her and she at him. And The Messenger of Allah (ﷺ) started turning al-Fadl's face to the other side. She said: O Messenger of Allah, Allah's command to His slaves to do Hajj has came when my father is an old man and cannot sit firmly on his mount, can I do Hajj on his behalf? He said: "Yes." That was during the farewell Pilgrimage.