The Messenger of Allah ﷺ said, "Whoever buys a sheep whose udder has been bound up to make it look full of milk has the choice for three days. If he wishes, he may keep it, and if he wishes, he may return it, returning with it a portion of dates."
وقال من ابتاع شاة مصراة فهو فيها بالخيار ثلاثة أيام فإن شاء أمسكها وإن شاء ردها ورد معها صاعا من تمر