16:66
وَإِنَّ لَكُمْ فِى ٱلْأَنْعَـٰمِ لَعِبْرَةً ۖ نُّسْقِيكُم مِّمَّا فِى بُطُونِهِۦ مِنۢ بَيْنِ فَرْثٍ وَدَمٍ لَّبَنًا خَالِصًا سَآئِغًا لِّلشَّـٰرِبِينَ
wa-inna lakum fī l-anʿāmi laʿib'ratan nus'qīkum mimmā fī buṭūnihi min bayni farthin wadamin labanan khāliṣan sāighan lilshāribīna
In livestock, too, you have a lesson- We give you a drink from the contents of their bellies, between waste matter and blood, pure milk, sweet to the drinker.
And verily! In the cattle, there is a lesson for you. We give you to drink of that which is in their bellies, from between excretions and blood, pure milk; palatable to the drinkers.