Bible Dictionaries
Reins

American Tract Society Bible Dictionary

Or KIDNEYS. The Hebrews often make the reins the seat of the affections, and ascribe to them knowledge, joy, pain, pleasure; hence in Scripture it is said that God searches the heart and tries the reins.

Bibliography Information
Rand, W. W. Entry for 'Reins'. American Tract Society Bible Dictionary. https://www.studylight.org/​dictionaries/​eng/​ats/​r/reins.html. 1859.