The Messenger of Allah (SWAS)saw a man driving the sacrificial camel. He said ride on it. He said this is a sacrificial camel. He again said ride on it, bother you, either the second or the third time he spoke.  

أَنَّ رَسُولَ اللَّهِ ﷺ رَأَى رَجُلاً يَسُوقُ بَدَنَةً فَقَالَ ارْكَبْهَا قَالَ إِنَّهَا بَدَنَةٌ فَقَالَ ارْكَبْهَا وَيْلَكَ فِي الثَّانِيَةِ أَوْ فِي الثَّالِثَةِ  

I asked Jabir bin ʿAbdallah about riding on the sacrificial camels. He said I heard The Messenger of Allah (SWAS) saying ride on them gently when you have nothing else till you find a mount.  

سَمِعْتُ رَسُولَ اللَّهِ ﷺ يَقُولُ ارْكَبْهَا بِالْمَعْرُوفِ إِذَا أُلْجِئْتَ إِلَيْهَا حَتَّى تَجِدَ ظَهْرًا