don t cook a young goat in its mother's milk

I have never seen that used as an expression. Its meaning is quite literal. It is a Biblical injunction.

Can use it in a context? Does it mean that something is prohibited or what? How strong is the expression?

Ol Good in a context?

Yes. You could use it in the context of cooking a goat in milk, but then how often are you going to need to forbid people to do that?

If I were you, I'd forget it. Spend your time learning some English that is more useful.

It is in Jewish law, from the book of Exodus and Deuteronomy.
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The deeper meaning is not to dishonor motherhood.

Deuteronomy 14:
4 These are the animals you may eat: the ox, the sheep, the goat,
5 the deer, the gazelle, the roe deer, the wild goat, the ibex, the antelope and the mountain sheep.
6 You may eat any animal that has a divided hoof and that chews the cud.

AlpheccaStarsThe deeper meaning is not to dishonor motherhood.

Really? I thought it had to do with mixing meat and dairy. I would never have thought of the motherhood angle, but then I'm not exactly a Bible scholar.

Thank you very much for the explanation! I have been looking for a figurative meaning. Now I've got it, there isn't any.

Ol GoodNow I've got it, there isn't any.

Not exactly. See Alphecca's reply. She knows a lot more about the Bible than I do.

I still don't think you're going to be able to slip this quote into a conversation and expect to be understood.

CJ

I ve stumbled on it in a book explaining different public signs. There was a sign thah prohibits smth. And then a question: what does it mean? and three options. One of them was this expression. It was some kind of joke then. I am not going to use it.

Ol GoodI ve stumbled on it

FYI: I stumbled on it

CJ