Volume 3, Book 42, Number 614:
Narrated Ibn ‘Umar:
Allah’s Apostle said, “An animal should not be milked without the permission of its owner. Does
any of you like that somebody comes to his store and breaks his container and takes away his food?
The udders of the animals are the stores of their owners where their provision is kept, so nobody
should milk the animals of somebody else, without the permission of its owner.”