Sahih Bukhari

My father set out (for Mecca) in the year of Al-Hudaibiya, and his companions assumed Ihram, but he did not. At that time the Prophet (ﷺ) was informed that an enemy wanted to attack him, so the Prophet (ﷺ) proceeded onwards. While my father was among his companions, some of them laughed among themselves. (My father said), "I looked up and saw an onager. I attacked, stabbed and caught it. I then sought my companions' help but they refused to help me. (Later) we all ate its meat. We were afraid that we might be left behind (separated) from the Prophet (ﷺ) so I went in search of the Prophet (ﷺ) and made my horse to run at a galloping speed at times and let it go slow at an ordinary speed at other times till I met a man from the tribe of Bani Ghifar at midnight. I asked him, "Where did you leave the Prophet (ﷺ) ?" He replied, "I left him at Ta'hun and he had the intention of having the midday rest at As-Suqya. I followed the trace and joined the Prophet (ﷺ) and said, 'O Allah's Messenger (ﷺ)! Your people (companions) send you their compliments, and (ask for) Allah's Blessings upon you. They are afraid lest they may be left behind; so please wait for them.' I added, 'O Allah's Messenger (ﷺ)! I hunted an onager and some of its meat is with me. The Prophet (ﷺ) told the people to eat it though all of them were in the state of Ihram."

That his father said "We proceeded with the Prophet (ﷺ) in the year of Al-Hudaibiya and his companions assumed Ihram but I did not. We were informed that some enemies were at Ghaiqa and so we went on towards them. My companions saw an onager and some of them started laughing among themselves. I looked and saw it. I chased it with my horse and stabbed and caught it. I wanted some help from my companions but they refused. (I slaughtered it all alone). We all ate from it (i.e. its meat). Then I followed Allah's Messenger (ﷺ) lest we should be left behind. At times I urged my horse to run at a galloping speed and at other times at an ordinary slow speed. On the way I met a man from the tribe of Bani Ghifar at midnight. I asked him where he had left Allah's Messenger (ﷺ) . The man replied that he had left the Prophet (ﷺ) at a place called Ta'hun and he had the intention of having the midday rest at As-Suqya. So, I followed Allah's Messenger (ﷺ) till I reached him and said, "O Allah's Messenger (ﷺ)! I have been sent by my companions who send you their greetings and compliments and ask for Allah's Mercy and Blessings upon you. They were afraid lest the enemy might intervene between you and them; so please wait for them." So he did. Then I said, "O Allah's Messenger (ﷺ)! We have hunted an onager and have some of it (i.e. its meat) left over." Allah's Messenger (ﷺ) told his companions to eat the meat although all of them were in a state of Ihram."

We were in the company of the Prophet (ﷺ) at a place called Al-Qaha (which is at a distance of three stages of journey from Medina). Abu Qatada narrated through another group of narrators: We were in the company of the Prophet (ﷺ) at a place called Al-Qaha and some of us had assumed Ihram while the others had not. I noticed that some of my companions were watching something, so I looked up and saw an onager. (I rode my horse and took the spear and whip) but my whip fell down (and I asked them to pick it up for me) but they said, "We will not help you by any means as we are in a state of Ihram." So, I picked up the whip myself and attacked the onager from behind a hillock and slaughtered it and brought it to my companions. Some of them said, "Eat it." While some others said, "Do not eat it." So, I went to the Prophet (ﷺ) who was ahead of us and asked him about it, He replied, "Eat it as it is Halal (i.e. it is legal to eat it).