The Bee
IN THE NAME OF GOD, THE MOST GRACIOUS, THE DISPENSER OF GRACE[16:66]
And, behold, in the cattle [too] there is indeed a lesson for you: We give you to drink of that [fluid] which is [secreted from] within their bellies between that which is to be eliminated [from the animal’s body] and [its] life-blood: milk pure and pleasant to those who drink it.

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* v.66 : Milk – in itself a glandular secretion – is not necessary for the mother-animal’s life (or, as it is here metonymically described, its “blood”); on the other hand, it is not just something that the body eliminates as being of no further use to its metabolism: hence it is referred to as a substance “between that which is to be eliminated [from the animal’s body] and [its] life-blood.”