It was narrated from ‘Abdullah bin ‘Abbas (RA): “Al-Fadal bin ‘Abbas was riding behind the Messenger of Allah ﷺ: when a woman from Khath’am came and asked him a question. Al-Fadal started looking at her and she at him, and the Messenger of Allah ﷺ turned Al-Fadal’s face to the other side. She said: ‘Messenger of Allah ﷺ! The command of Allah has come for His slaves to perform Hajj)’, but my father is an old man and cannot sit firmly in the saddle; should I perform Hajj on his behalf?’ He said: ‘Yes.’ That happened during the Farewell Pilgrimage.” (Sahih)