|Easton's Bible Dictionary|
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 (Psalm 7:9; 16:7; 26:2; 139:13; Jeremiah 17:10, etc.).
Noah Webster's Dictionary
1. (n. pl.) The kidneys; also, the region of the kidneys; the loins.
2. (n. pl.) The inward impulses; the affections and passions; -- so called because formerly supposed to have their seat in the part of the body where the kidneys are.
Int. Standard Bible Encyclopedia
ranz (kilyah; nephros, words promiscuously translated "heart," "inward parts," "kidneys" or "reins." The latter word, which is derived from Latin "renes" through Old French "reins", has given place in modern English to the word "kidneys" (see Skeat, Concise Etymological Dictionary of the English Language, 398). the Revised Version (British and American) has, however, retained the older word, at least in the margin, in all passages in which it is found in the King James Version): According to Hebrew psychology the reins are the seat of the deepest emotions and affections of man, which God alone can fully know. Thus the Revised Version (British and American) has substituted "heart" for "reins" in the text of Job 19:27 Psalm 7:9; Psalm 16:7; Psalm 26:2; 73:21 Proverbs 23:16 Jeremiah 11:20; Jeremiah 12:2; Jeremiah 17:10; Jeremiah 20:12; the translation "inward parts" is found but once (Psalm 139:13). In one passage the King James Version has translated the Hebrew halac ("loins") with "reins" (Isaiah 11:5), where the Revised Version (British and American) has rightly substituted "waist" (which see). The Greek word nephros (which is etymologically allied to the Middle English nere, Get. Niere; see Skeat, ibid, 231, under the word "Kidney") is found in 1 Maccabees 2:24; Revelation 2:23.
H. L. E. Luering
Reins (15 Occurrences)
Revelation 2:23 And I will kill her children with death; and all the churches shall know that I am he which searcheth the reins and hearts: and I will give unto every one of you according to your works. (KJV ASV DBY WBS YLT)
Job 16:13 His archers compass me round about, he cleaveth my reins asunder, and doth not spare; he poureth out my gall upon the ground. (KJV JPS ASV DBY WBS YLT)
Job 19:27 Whom I shall see for myself, and mine eyes shall behold, and not another; though my reins be consumed within me. (KJV JPS DBY WBS YLT)
Psalms 7:9 Oh let the wickedness of the wicked come to an end; but establish the just: for the righteous God trieth the hearts and reins. (KJV JPS DBY WBS YLT)
Psalms 16:7 I will bless the LORD, who hath given me counsel: my reins also instruct me in the night seasons. (KJV JPS DBY WBS YLT)
Psalms 26:2 Examine me, O LORD, and prove me; try my reins and my heart. (KJV JPS DBY WBS YLT)
Psalms 73:21 Thus my heart was grieved, and I was pricked in my reins. (KJV JPS DBY WBS YLT)
Psalms 139:13 For thou hast possessed my reins: thou hast covered me in my mother's womb. (KJV JPS DBY WBS YLT)
Proverbs 23:16 Yea, my reins shall rejoice, when thy lips speak right things. (KJV JPS DBY WBS YLT)
Isaiah 11:5 And righteousness shall be the girdle of his loins, and faithfulness the girdle of his reins. (KJV JPS DBY WBS YLT)
Jeremiah 11:20 But, O LORD of hosts, that judgest righteously, that triest the reins and the heart, let me see thy vengeance on them: for unto thee have I revealed my cause. (KJV JPS DBY WBS YLT)
Jeremiah 12:2 Thou hast planted them, yea, they have taken root: they grow, yea, they bring forth fruit: thou art near in their mouth, and far from their reins. (KJV JPS DBY WBS YLT)
Jeremiah 17:10 I the LORD search the heart, I try the reins, even to give every man according to his ways, and according to the fruit of his doings. (KJV JPS DBY WBS YLT)
Jeremiah 20:12 But, O LORD of hosts, that triest the righteous, and seest the reins and the heart, let me see thy vengeance on them: for unto thee have I opened my cause. (KJV JPS DBY WBS YLT)
Lamentations 3:13 He hath caused the arrows of his quiver to enter into my reins. (KJV JPS ASV DBY WBS YLT)