In Context

3 And they have bent their tongue, as a bow, for lies, and not for truth: they have strengthened themselves upon the earth, for they have proceeded from evil to evil, and me they have not known, saith the Lord.

4 Let every man take heed of his neighbor, and let his not trust in any brother of his: for every brother will utterly supplant, and every friend will walk deceitfully.

5 And a man shall mock his brother, and they will not speak the truth: for they have taught their tongue to speak lies: they have laboured to commit iniquity.

6 Thy habitation is in the midst of deceit: Through deceit they have refused to know me, saith the Lord.

7 Therefore thus saith the Lord of hosts: Behold I will melt, and try them: for what else shall I do before the daughter of my people?

8 Their tongue is a piercing arrow, it hath spoken deceit: with his mouth one speaketh peace with his friend, and secretly he lieth in wait for him.

Jeremiah 9:6 in Other Translations