'Natural' in the Bible

You may not have as food anything which has come to a natural death; the man from another country who is living with you may take it for food, or you may get a price for it from one of another nation; for you are a holy people to the Lord your God. The young goat is not to be cooked in its mother's milk.

And Moses was an hundred and twenty years old when he died: his eye was not dim, nor his natural force abated.