"reins"
15 occurrences in KJV
But, O LORD of hosts, that triest the righteous, and seest the reins and the heart, let me see thy vengeance on them: for unto thee have I opened my cause.
But, O LORD of hosts, that judgest righteously, that triest the reins and the heart, let me see thy vengeance on them: for unto thee have I revealed my cause.
Thou hast planted them, yea, they have taken root: they grow, yea, they bring forth fruit: thou art near in their mouth, and far from their reins.
I the LORD search the heart, I try the reins, even to give every man according to his ways, and according to the fruit of his doings.
His archers compass me round about, he cleaveth my reins asunder, and doth not spare; he poureth out my gall upon the ground.
Whom I shall see for myself, and mine eyes shall behold, and not another; though my reins be consumed within me.