'Loins' in the Bible

but you yourself will not build the house, but your son who will proceed from your loins; he himself will build the house for my name.'

Then the young men who had grown up with him said to him, "Thus you should say to this people who have said to you, 'Your father made our yoke heavy, so you yourself should lighten [it] for us.' Thus you should say to them, 'My little finger [is] thicker than the loins of my father.

Then Yahweh sent an angel, and he destroyed every mighty warrior of strength, commander, and officer in the camp of the king of Assyria. And he returned with shamed face to his land and went into the house of his god. And some of the offspring of his loins fell upon him there with the sword.