Reins
Easton, 1897
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 (Psalms 7:9; Psalms 16:7; Psalms 26:2; Psalms 139:13; Jeremiah 17:10, etc.).
Dictionary: M. G. Easton, Illustrated Bible Dictionary (1897, public domain).