'Loins' in the Bible

Now you also know what Joab the son of Zeruiah [my sister] did to me, and what he did to the two commanders of the armies of Israel, to Abner the son of Ner and to Amasa the son of Jether, [both of] whom he murdered; avenging the blood of war in [a time of] peace. And he put the [innocent] blood of war [of Abner and Amasa] on his belt that was around his waist, and on his sandals on his feet.

The young men who had grown up with him answered, “This is what you should say to this people who told you, ‘Your father made our yoke heavy, but as for you, make our yoke lighter’—say this to them: ‘My little finger is thicker than my father’s loins [and my reign will be even more severe].

Then the hand of the Lord came upon Elijah [giving him supernatural strength]. He girded up his loins and outran Ahab to the entrance of Jezreel [nearly twenty miles].

But his servants said to him, “We have heard that the kings of the house (royal line) of Israel are merciful kings. Please let us put sackcloth around our loins and ropes on our necks [as symbols of submission], and go out to the king of Israel; perhaps he will spare your life.”

So they put sackcloth around their loins and ropes on their necks, and came to the king of Israel and said, “Your servant Ben-hadad says, ‘Please let me live.’” And Ahab asked, “Is he still alive? He is my brother.”