νεφρόςnephrós
GreekG35101 occurrences (KJV)
a kidney (plural), i.e. (figuratively) the inmost mind
KJV renders it: reins
Where it appears
- Rev 2:23I will kill her children with Death, and all the assemblies will know that I am he who searches the minds and hearts. I will give to each one of you according to your deeds.
Lexical data: Strong’s Hebrew & Greek Dictionaries (1890, public domain; openscriptures, CC-BY-SA). Word tagging from the Strong’s-numbered KJV.