And the Messenger of Allah, peace and blessings be upon him, said: "When any one of you buys a «مصراة» (an animal whose milk has been retained in its udders) she-camel or goat, after milking it, he has the choice of two options: if he wishes, he may keep it, or if he wishes, he may return it, and in exchange for the milk he has milked, he should give the owner a «صاع» of dates."