Surah An-Nahl — Ayah 66 (16:66)
وَإِنَّ لَكُمۡ فِي ٱلۡأَنۡعَٰمِ لَعِبۡرَةٗۖ نُّسۡقِيكُم مِّمَّا فِي بُطُونِهِۦ مِنۢ بَيۡنِ فَرۡثٖ وَدَمٖ لَّبَنًا خَالِصٗا سَآئِغٗا لِّلشَّٰرِبِينَ ٦٦
English translation (Saheeh International)
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.
Brief commentary
There is a lesson for you to take - O people - in camels, cows and goats: We give you to drink from their udders milk that comes out from in between the waste that the stomach contains and the blood that is in the body. Despite this it comes out as pure milk that is tasty and pleasant to those who drink it.