Solomon
Proverbs 15:11ESV·traditional attribution

Sheol and Abaddon lie open before the LORD; how much more the hearts of the children of man!

Matthew Henry Presbyterian @wholebiblehenry

This confirms what was said (Pro 15:3) concerning God's omnipresence, in order to his judging of evil and good. 1. God knows all things, even those things that are hidden from the eyes of all living: Hell and destruction are before the Lord, not only the centre of the earth, and its subterraneous caverns, but the grave, and all the dead bodies which are there...

John Gill Reformed Baptist @doctorgill

Hell and destruction are before the Lord,.... Or "the grave" (a), which is the pit of destruction; where bodies being put, putrefy, and are destroyed by worms: this is known by the Lord, even the grave of everyone from the beginning; the graves of Adam, Abel, Abraham; he knows where their dust lies, and will raise it up again at the last day.

Jamieson-Fausset-Brown Reformed @jfbcommentary

Hell-- (Psa 16:10). destruction--or, "Abaddon," the place of the destroyer. All the unseen world is open to God, much more men's hearts.