An-Nahl 16:66

وَإِنَّ لَكُمۡ فِي ٱلۡأَنۡعَٰمِ لَعِبۡرَةٗۖ نُّسۡقِيكُم مِّمَّا فِي بُطُونِهِۦ مِنۢ بَيۡنِ فَرۡثٖ وَدَمٖ لَّبَنًا خَالِصٗا سَآئِغٗا لِّلشَّـٰرِبِينَ 66

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