عَنْ عَبْدِ اللَّهِ بْنِ مَسْعُودٍ رَضِيَ اللَّهُ عَنْهُ قَالَ حَدَّثَنَا رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ وَهُوَ الصَّادِقُ الْمَصْدُوقُ قَالَ بَيْعُ الْمُحَفَّلَاتِ خِلَابَةٌ وَلَا تَحِلُّ الْخِلَابَةُ لِمُسْلِمٍ
It is narrated from Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him), who is truthful and trusted, said: Selling animals whose milk has been withheld is deception, and it is not lawful for a Muslim to deceive.