Matthew Poole and continuators on Jeremiah 9:6

6 Thine habitation is in the midst of deceit: through deceit they refuse to know me, saith the LORD.

This God speaks to the Prophet, either to inform him, that there is no hope of this peoples reformation, chap. 8.5. therefore he expresseth a deceitful people by the abstract, deceit, i. e. nothing among them, but deceit one to another; and Hypocrisie towards me, as Psal. 109.2. and vanity for vain men, Iob 35.13. or to caution, and advise him how to behave himself among such a people that he be very wary, he be not ensnared by them, chap. 12.6.

Either hoping to shift well enough by their several means, they think to use, chap. 8.5. they are careless of turning to me, or by hearkening to their false Prophets, who have all along deceived, them they obstinately reject my wayes, and Counsels, Psal. 36.1, 2, 3, 4. and 82.5.