Deuteronomy 22:1-3

If you see your fellow Israelite’s ox or sheep straying, do not ignore it but be sure to take it back to its owner. If they do not live near you or if you do not know who owns it, take it home with you and keep it until they come looking for it. Then give it back. Do the same if you find their donkey or cloak or anything else they have lost. Do not ignore it.