Abdullah bin Abbas reported,

The Messenger of Allah ﷺ seated Fadl bin Abbas behind him on the back of his mount on the Day of Sacrifice. Fadl was a handsome man. The Prophet ﷺ stopped to give the people religious rulings, and a beautiful woman from Khathaam came forward to seek a ruling from the Messenger of Allah ﷺ. Fadl began staring at her, struck by her beauty. The Prophet ﷺ turned and saw Fadl looking at her, so he reached his hand back, took hold of Fadl's chin, and turned his face away from looking at her.She said, "Messenger of Allah, Allah's obligation upon His servants regarding Hajj has reached my father as a very old man who cannot sit upright on a mount. Will it suffice for him if I perform Hajj on his behalf?"He replied, "Yes."

عن عبد الله بن عباس قال

أردف رسول الله ﷺ الفضل بن عباس يوم النحر خلفه على عجز راحلته، وكان الفضل رجلا وضيئا، فوقف النبي ﷺ للناس يفتيهم، وأقبلت امرأة من خثعم وضيئة تستفتي رسول الله ﷺ، فطفق الفضل ينظر إليها، وأعجبه حسنها، فالتفت النبي ﷺ والفضل ينظر إليها، فأخلف بيده فأخذ بذقن الفضل، فعدل وجهه عن النظر إليها، فقالت: يا رسول الله، إن فريضة الله في الحج على عباده، أدركت أبي شيخا كبيرا، لا يستطيع أن يستوي على الراحلة، فهل يقضي عنه أن أحج عنه؟ قال: نعم.