Sunan An-Nasa'i

It was narrated from Abu Rafi that the Messenger of Allah borrowed a young camel from a man, and then he came to get his camel back. He said to a man:""Go and buy a young camel for him."" He came and said: ""I could only get a Raba camel of good quality."" He said: ""Give it to him, for the best of the Muslims is the one who is best in repaying