Strong’s H2910

טֻחָה

tuchah · 2 Old Testament occurrences

(in the plural only) the kidneys (as being covered); hence (figuratively) the inmost thought

Strong’s Hebrew, public domain

King James renderings: inward parts.

Every Old Testament occurrence

Job 38:36Who hath put wisdom in the inward parts? or who hath given understanding to the heart?
Psalms 51:6Behold, thou desirest truth in the inward parts: and in the hidden part thou shalt make me to know wisdom.