Kidney
Kidney
(only in plur. , kelayoth’, prob. from the idea of its being the seat of longing), the leaf-fat around which was specially to be a burnt-offering, significant of its being the richest and most central part of the victim (Exo 29:13; Exo 29:22; Lev 3:4; Lev 3:10; Lev 3:15; Lev 4:9; Lev 7:4; Lev 8:16; Lev 8:25; Lev 9:10; Lev 9:19; Isa 34:3). Spoken also of the ” reins” of a human being, i.e. the inmost soul, which the ancients supposed to be seated in the viscera (compare the Homeric , midriff, hence mind), both in a physical sense (Job 16:13; Job 19:27; Psa 139:13; Lam 3:13), and figuratively (Psa 7:9; Psa 16:7; Psa 26:2; Psa 73:21; Pro 23:16; Jer 11:20; Jer 12:2; Jer 17:10; Jer 20:12). Sometimes applied to kernels of grain, from their kidney-like shape and richness (Deu 32:14).
Fuente: Cyclopedia of Biblical, Theological and Ecclesiastical Literature
Kidney
Exo 29:13 (c) This figure probably indicates those secret activities of the life which are occupied with unpleasant things which should not be made known, and yet are necessary and must be given into.