Sahih Bukhari

Narrated Zaid bin Khalid:A man came to Allah's Messenger (ﷺ) and asked about Al-Luqata (a fallen thing). The Prophet (ﷺ) said, ""Recognize its container and its tying material and then make a public announcement about it for one year and if its owner shows up, give it to him; otherwise use it as you like."" The man said, ""What about a lost sheep?"" The Prophet (ﷺ) said, ""It is for you, your brother or the wolf."" The man said ""What about a lost camel?"" The Prophet (ﷺ) said, ""Why should you take it as it has got its water-container (its stomach) and its hooves and it can reach the places of water and can eat the trees till its owner finds it?