"The Messenger of Allah only performed the Sa'i of the House and of As-Safa and Al-Marwah to show his strength to the idolaters."  

إِنَّمَا سَعَى رَسُولُ اللَّهِ ﷺ بِالْبَيْتِ وَبَيْنَ الصَّفَا وَالْمَرْوَةِ لِيُرِيَ الْمُشْرِكِينَ قُوَّتَهُ قَالَ وَفِي الْبَابِ عَنْ عَائِشَةَ وَابْنِ عُمَرَ وَجَابِرٍ  

"I saw Ibn Umar walking at the place of Sa'i so I said to him: 'Do you walk at the place of Sa'i between As-Safa and Al-Marwah?' He said: 'If I performed Sa'i, then it is because I saw the Messenger of Allah performing Sa'i there, and if I walked, then it is because I have seen the Messenger of Allah walking. And I am an old man.'"  

لَئِنْ سَعَيْتُ لَقَدْ رَأَيْتُ رَسُولَ اللَّهِ ﷺ يَسْعَى وَلَئِنْ مَشَيْتُ لَقَدْ رَأَيْتُ رَسُولَ اللَّهِ ﷺ يَمْشِي وَأَنَا شَيْخٌ كَبِيرٌ