Sunan Ibn Majah #2504 · The Chapters on Charity

He turned red, and he said: “What does it have to do with you? It has its feet and its water supply, it can go and drink water and eat from the trees until its owner finds it.” And he was asked about lost sheep, and he said: “Take it, for it will be for you or for your brother or for the wolf.” And he was asked about lost property and he said: “Remember the features of its leather bag and strap, and announce it for one year, then if someone claims it, describing it to you with those features (give it to him), otherwise incorporate it into your own wealth.”