"And indeed, for you in grazing livestock is a lesson. We give you drink from wha…" — An-Nahl 16:66

وَإِنَّ لَكُمْ فِى ٱلْأَنْعَٰمِ لَعِبْرَةًۭ ۖ نُّسْقِيكُم مِّمَّا فِى بُطُونِهِۦ مِنۢ بَيْنِ فَرْثٍۢ وَدَمٍۢ لَّبَنًا خَالِصًۭا سَآئِغًۭا لِّلشَّٰرِبِينَ

Wa inna lakum fil an'aami la'ibrah; nusqeekum mimmmaa fee butoonihee mim baini farsinw wa damil labanann khaalisan saaa'ighallish shaaribeen

And indeed, for you in grazing livestock is a lesson. We give you drink from what is in their bellies - between excretion and blood - pure milk, palatable to drinkers.