Deuteronomy 22:1-3

1When you see your neighbor’s ox or sheep going astray, do not ignore it; you must return it without fail to your neighbor.

2If the owner does not live near you or you do not know who the owner is, then you must corral the animal at your house and let it stay with you until the owner looks for it; then you must return it to him.

3You shall do the same to his donkey, his clothes, or anything else your neighbor has lost and you have found; you must not refuse to get involved.