Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both) says that the Prophet (peace and blessings be upon him) seated Sayyiduna al-Fadl bin Abbas (may Allah be pleased with him) behind him on his mount, and al-Fadl was a handsome man. The Prophet (peace and blessings be upon him) stopped to give the people rulings, and a beautiful woman from the tribe of Khath'am turned towards him; she was asking the Prophet (peace and blessings be upon him) for a ruling. Al-Fadl looked at her, and her beauty pleased him. The Prophet (peace and blessings be upon him) looked at al-Fadl and saw that he was looking at the woman, so the Prophet (peace and blessings be upon him) took hold of al-Fadl's chin and turned his face to the other side. This Khath'ami woman said: "O Messenger of Allah! The obligation of Hajj has reached my father when he is a very old man, and he cannot sit on a mount; if I perform Hajj on his behalf, will it suffice?" The Prophet (peace and blessings be upon him) said: "Yes." [Sahih. Bukhari: 4138]
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الحج / 9851