'Loins' in the Bible

He loosens [the] fetters of kings, and he binds a loincloth on their loins.

"Because he has covered his face with his fat and has gathered fat upon [his] loins,

if his loins have not blessed me, or by means of my sheep's fleece he has warmed himself,

Look, its strength [is] in its loins and its power in the muscles of its stomach.