Ezekiel 14:3 - Ellicott's Commentary On The Whole Bible

Have set up their idols in their heart. — It was not the open idolatry of Judæa which is reproved among these elders of the captivity; that had already passed away, but still their heart was not right. Like Lot’s wife, they longed for that which they dared not do. With such a disposition, they were in the greatest danger, putting “the stumbling-block of their iniquity,” the temptation to sin, directly before them. And not only so, but they kept themselves in a state of alienation from God, so that it was idle to imagine He would allow Himself to be enquired of by them. The question implies the negative answer which is fully expressed in the following verses.