G3510
νεφρός
mind
νεφρός, -οῦ, ὁ [in LXX for כִּלְיָה, Exo.29:13, al.; metaphorically, Psa.7:9 16:7 26:2, Wis.1:6, al. ;] a kidney; pl., the kidneys, reins; metaphorically, of the will and affections: ν. καί καρδίαι (thoughts), Rev.2:23.† (AS)
The KJV translates G3510 in the following manner:
reins (2x)
Full Thayer's lexicon entry
νεφρός — nephrós
νεφρός, νεφρου, ὁ, a kidney (Plato, Aristophanes); plural the kidneys, the loins, as the Sept. for כְּלָיות, used of the inmost thoughts, feelings, purposes, of the soul: with the addition of καρδίας, Rev 2:23, with which cf. Psa 7:10; Jer 11:20; Jer 17:10; Wis 1:6.
1 occurrence