The Holy Quran 16:66 — Surah An-Nahl

Arabic text

وَإِنَّ لَكُمْ فِى ٱلْأَنْعَـٰمِ لَعِبْرَةً ۖ نُّسْقِيكُم مِّمَّا فِى بُطُونِهِۦ مِنۢ بَيْنِ فَرْثٍ وَدَمٍ لَّبَنًا خَالِصًا سَآئِغًا لِّلشَّـٰرِبِينَ

Translation

There is certainly a lesson for you in livestock (signs that point towards Allaah's greatness and Towheed). From what is in their bellies between excrement(filth) and blood, We give you pure milk to drink that is easily consumed. (Although the stomach of animals is an impure environment having blood and excreta always present, Allaah has the immense power to create pure and palatable milk there.)

Tafsir (excerpt) — Tafsir Usmani

Signs for reflection in livestock: that is, the grass and fodder that camels, cows, buffaloes and other animals eat, on reaching the stomach, is transformed into three things. Divine power has installed inside the bodies of these animals such a machine that breaks down the food, casting part of it out as waste (dung)

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