Upon the truth - God looks to the “faith,” the upright purpose of the heart, and without it the nominal fealty of an oath is an abomination.
Related Commentaries of Jeremiah 5:3
Jeremiah 5:3
3 O LORD, are not thine eyes upon the truth? thou hast stricken them, but they have not grieved; thou hast consumed them, but they have refused to receive correction: they have made their faces harder than a rock; they have refused to return.