'Innermost' in the Bible

Let the evil of the wicked come to an end, but establish [the] righteous, and test the hearts and innermost being, O righteous God.

I will bless Yahweh who advises me; yes, [at] night my {innermost being} instructs me.

Prove me, O Yahweh, and test me. Try my {innermost being} and my {mind}.