Jami` at-Tirmidhi 847

Abu Qatadah narrated that:He was with the Prophet and when he got to one of the roads of Makkah some of the companions were Muhrim and he (Abu Qatadah) was not a Muhrim. So he saw a wild donkey, so he mounted his horse, asked his companions to give him his whip but they refused, so he asked them to give him his spear and they refused. So he (himself) took it and struck the donkey killing it. Some of the Companions of the Prophet ate it and some of them refused. When they caught up to the Prophet they asked him about that and he said: "It is only food which Allah fed you