John Gill Commentary Jeremiah 16:17

"For mine eyes are upon all their ways; they are not hid from my face, neither is their iniquity concealed from mine eyes." — Jeremiah 16:17 (ASV)

For my eyes are upon all their ways
Not only which they may take to hide themselves from their enemies, and where they should be directed to find them; but their evil ways in which they walked, and which were the cause of their calamities; these, how secret soever they were, were under the eye of God, whose eyes are in every place, and upon all the ways of men, good and bad; though they might flatter themselves, as wicked men sometimes do, that the Lord sees them not, and does not take notice of their iniquities:

but, that they might be assured of the contrary, it is added, they are not hid from my face, neither is their iniquity hid from my eyes ;
neither their ways nor their works, their persons nor their actions, could be concealed from the Lord; none can hide himself in secret places, that they should not be seen by him; the darkness and the light are both alike to an omniscient God.

The Targum is, "their iniquities are not hid from before (or from, or the sight of) my Word;" the essential Word of God; see (Hebrews 4:12Hebrews 4:13) .