Sunan An-Nasa'i
Hadith #2819
It was narrated from As-Sab bin Jaththamah that:he gave the Messenger of Allah an onager when he was in Al-Abwa or in Waddan, but the Messenger of Allah gave it back to him. ""And when the Messenger of Allah saw the expression on my face he said: ""We only gave it back to you because we are in Ihram