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ReinsEASTON'S
The kidneys, the supposed seat of the desires and affections; used metaphorically for “heart.” The “reins” and the “heart” are often mentioned together, as denoting the whole moral constitution of man (Ps. 7:9; 16:7; 26:2; 139:13; Jer. 17:10, etc.).
Easton's Illustrated Bible Dictionary, 3rd ed. (1897), public domain.