Sahih al-Bukhari 2435
Narrated Ibn `Umar:
Allah's Messenger (ﷺ) 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."
حَدَّثَنَا عَبْدُ اللَّهِ بْنُ يُوسُفَ، أَخْبَرَنَا مَالِكٌ، عَنْ نَافِعٍ، عَنْ عَبْدِ اللَّهِ بْنِ عُمَرَ ـ رضى الله عنهما ـ أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ ‏
"‏ لاَ يَحْلُبَنَّ أَحَدٌ مَاشِيَةَ امْرِئٍ بِغَيْرِ إِذْنِهِ، أَيُحِبُّ أَحَدُكُمْ أَنْ تُؤْتَى مَشْرُبَتُهُ فَتُكْسَرَ خِزَانَتُهُ، فَيُنْتَقَلَ طَعَامُهُ فَإِنَّمَا تَخْزُنُ لَهُمْ ضُرُوعُ مَوَاشِيهِمْ أَطْعِمَاتِهِمْ، فَلاَ يَحْلُبَنَّ أَحَدٌ مَاشِيَةَ أَحَدٍ إِلاَّ بِإِذْنِهِ ‏"‏‏.‏