Narrated Ibn `Umar: That he was in the company of the Prophet on a journey, riding a troublesome camel belonging to `Umar. The camel used to go ahead of the Prophet, so Ibn `Umar's father would say, O `Abdullah! No one should go ahead of the Prophet. The Prophet said to him, Sell it to me. `Umar said to the Prophet It is for you. So, he bought it and said, O `Abdullah! It is for you, and you can do with it what you like.