'Loins' in the Bible

And God said to him, I am the Almighty God: be fruitful and multiply; a nation and a company of nations shall be of thee; and kings shall come out of thy loins.

And Jacob rent his clothes, and put sackcloth on his loins, and mourned for his son many days.

All the souls that came with Jacob to Egypt, that had come out of his loins, besides Jacob's sons' wives: all the souls were sixty-six.