the Domestic Donkey: Laws Respecting: Astray, to be Taken Care of Till Its Owner Appeared
Source: TTT
Deuteronomy 22:2, 3
If your brother does not live near you, or if you do not know who he is, you are to take the animal home to remain with you until your brother comes seeking it; then you can return it to him. / And you shall do the same for his donkey, his cloak, or anything your brother has lost and you have found. You must not ignore it.