from H2909 (or H2902) in the sense of overlaying; (in the plural only) the kidneys (as being covered); hence (figuratively) the inmost thought; inward parts.
Usages throughout the bible
Job 38:36
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Who hath put wisdom in the inward parts? H2910 or who hath given understanding to the heart?
Psalms 51:6
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Behold, thou desirest truth in the inward parts: H2910 and in the hidden part thou shalt make me to know wisdom.
