Leviticus 3:4

4. The two kidneys Professor Bush suggests that the kidneys were burned because they are “the supposed seat of some of the strongest sensual propensities,” such as fornication and uncleanness. But we fail to see why the kidneys should be burned for this reason while the very organs of impurity are spared. The kidneys (reins) are, with the Scripture writers, the inmost seat of character. Their burning signifies the purgation, by the fire of the Holy Spirit, of the inscrutable depths of the spiritual nature and the cleansing of the heart from inbred sin. “God trieth the hearts and kidneys.” Psalms 7:9. “I try the kidneys.” Jeremiah 17:10. Outside of the Pentateuch the substitution of reins for kidneys occurs in the Authorized Version thirteen times in the Old Testament.

The caul above the liver These words are found together twice in Exodus, and quite often in the sacrificial ritual of Leviticus. In physiological terms it is “the small omentum which bounds part of the liver and the stomach, and comes into the region of the kidneys, and which is itself surrounded with the tunica adiposa a bed of fatty matter.”