"The Messenger of Allah (ﷺ) took a camel of a particular age on loan. He gave back to him a camel of a better age than the one he was given. He said: 'The best among you is the best in repaying.'"
He said: There is something on this topic from Abu Rafi'.
[Abu 'Eisa said:] The Hadith of Abu Hurairah is a Hasan Sahih Hadith. Shu'bah and Sufyan reported it from Salamah.
This is acted upon according to some of the people of knowledge, they saw no harm is taking a camel of a particular age as a loan. This is the view of Ash-Shafi'i, Ahmad, and Ishaq. But some of them disliked that.