Deuteronomy 22:1-3

If you see your brother’s ox or sheep straying, do not ignore it but be sure to take it back to him. If the brother does not live near you or if you do not know who he is, take it home with you and keep it until he comes looking for it. Then give it back to him. Do the same if you find your brother’s donkey or his cloak or anything he loses. Do not ignore it.