'Loins' in the Bible

Moreover thou knowest also what Joab the son of Zeruiah did unto me, even what he did to the two captains of the hosts of Israel, unto Abner the son of Ner, and unto Amasa the son of Jether, whom he slew, and shed the blood of war in peace, and put the blood of war upon his girdle that was about his loins, and in his shoes that were on his feet.

nevertheless thou shalt not build the house; but thy son that shall come forth out of thy loins, he shall build the house for my name.

And the young men that were grown up with him spake unto him, saying, Thus shalt thou say unto this people that spake unto thee, saying, Thy father made our yoke heavy, but make thou it lighter unto us; thus shalt thou speak unto them, My little finger is thicker than my father's loins.

and the hand of Jehovah was on Elijah; and he girded up his loins, and ran before Ahab to the entrance of Jezreel.

And his servants said unto him, Behold now, we have heard that the kings of the house of Israel are merciful kings: let us, we pray thee, put sackcloth on our loins, and ropes upon our heads, and go out to the king of Israel: peradventure he will save thy life.

So they girded sackcloth on their loins, and put ropes on their heads, and came to the king of Israel, and said, Thy servant Ben-hadad saith, I pray thee, let me live. And he said, Is he yet alive? he is my brother.