'Body' in the Bible

Behold, the word of Yahweh came to him, saying, "This man will not be your heir, but he who will come forth out of your own body will be your heir."

Yahweh said to her, "Two nations are in your womb. Two peoples will be separated from your body. The one people will be stronger than the other people. The elder will serve the younger."

God said to him, "I am God Almighty. Be fruitful and multiply. A nation and a company of nations will be from you, and kings will come out of your body.