The best portion of an animal sacrifice (Exod. 29: 13). They were thought to be the seat of human emotions, as in Jer. 11: 20 where modern translations prefer the metaphorical use of ‘heart’ (‘reins’ in AV).
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"kidneys." In A Dictionary of the Bible. Ed. W. R. F. Browning. Oxford Biblical Studies Online. Feb 9, 2016. <http://www.oxfordbiblicalcstudies.com/article/opr/t94/e1065>.
"kidneys." In A Dictionary of the Bible. , edited by W. R. F. Browning. Oxford Biblical Studies Online, http://www.oxfordbiblicalcstudies.com/article/opr/t94/e1065 (accessed Feb 9, 2016).