Hadith 8:2290
Abu Bakr narrated to us, he said: Waki’ narrated to us, from Sufyan, from Ibn Abi Najih, from ‘Ata’, that the Prophet (peace and blessings of Allah be upon him) granted them a concession to ride them when they were in need of them.
حدثنا أبو بكر قال حدثنا وكيع عن سفيان عن بن أبي نجيح عن عطاء أن النبي صلى الله عليه وسلم رخص لهم أن يركبوها إذا احتاجوا إليها