Bible Dictionary · R
Reins
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; Ps 16:7; Ps 26:2; Ps 139:13; Jer 17:10, etc.).
From Easton’s Bible Dictionary (1897), by Matthew George Easton.