'Loins' in the Bible

And all the souls that came out of the loins of Jacob were seventy souls: and Joseph was in Egypt already.

And thus shall ye eat it: with your loins girded, your shoes on your feet, and your staff in your hand; and ye shall eat it in haste: it is Jehovah's passover.

And thou shalt make them linen breeches to cover the flesh of their nakedness; from the loins even unto the thighs they shall reach: