Quran 23:21

وَإِنَّ لَكُمۡ فِى ٱلۡأَنۡعَـٰمِ لَعِبۡرَةً۬‌ۖ نُّسۡقِيكُم مِّمَّا فِى بُطُونِہَا وَلَكُمۡ فِيہَا مَنَـٰفِعُ كَثِيرَةٌ۬ وَمِنۡہَا تَأۡكُلُونَ ٢١

And the livestock should provide you with a lesson. We let you drink (milk) from their bellies, you derive other benefits from them, and some of them you use for food.