Sahih Bukhari Volume 2, Book 25, Hadith 1667

حَدَّثَنَا عَبْدُ اللَّهِ بْنُ يُوسُفَ، أَخْبَرَنَا مَالِكٌ، عَنْ هِشَامِ بْنِ عُرْوَةَ، عَنْ أَبِيهِ، أَنَّهُ قَالَ سُئِلَ أُسَامَةُ وَأَنَا جَالِسٌ، كَيْفَ كَانَ رَسُولُ اللَّهِ صلى الله عليه وسلم يَسِيرُ فِي حَجَّةِ الْوَدَاعِ حِينَ دَفَعَ قَالَ كَانَ يَسِيرُ الْعَنَقَ، فَإِذَا وَجَدَ فَجْوَةً نَصَّ‏.‏ قَالَ هِشَامٌ وَالنَّصُّ فَوْقَ الْعَنَقِ‏.‏ قَالَ أَبُو عَبْدِ اللَّهِ فَجْوَةٌ مُتَّسَعٌ، وَالْجَمِيعُ فَجَوَاتٌ وَفِجَاءٌ، وَكَذَلِكَ رَكْوَةٌ وَرِكَاءٌ‏.‏ مَنَاصٌ لَيْسَ حِينَ فِرَارٍ‏

Narrated By 'Urwa : Usama was asked in my presence, "How was the speed of (the camel of) Allah's Apostle while departing from 'Arafat during the Hajjatul Wada?" Usama replied, "The Prophet proceeded on with a modest pace, and when there was enough space he would (make his camel) go very fast."