Musnad Ahmad 30:3478

Yazid narrated to us, Sufyan al-Thawri informed us, from Salamah ibn Kuhayl, from Abu Salamah, from Abu Hurairah, that the Messenger of Allah (ﷺ) borrowed a camel from a man. The man came to demand his camel back, so he (the Prophet) said: "Seek a camel for him and give it to him." They did not find anything except a camel of a better age than his camel. They said: "O Messenger of Allah, we did not find anything except a camel of a better age than his camel." He said: "Give it to him, for the best of you are those who are the best in repaying."