Jeremias 9:5

5 Every one will mock his friend; they will not speak truth: their tongue has learned to speak falsehoods; they have committed iniquity, they ceased not, so as to return.

Jeremias 9:5 Meaning and Commentary

Jeremiah 9:5

And they will deceive everyone his neighbour
In conversation, with lying words; and in trade and commerce, by art and tricking: and will not speak the truth;
with respect to facts they report, or goods they sell: they have taught their tongue to speak lies;
and become so accustomed to lying that they cannot do otherwise; it is as it were natural to them: and weary themselves to commit iniquity;
spared no pains to come at it, nor any in it, and go on even to weariness; are more laborious and indefatigable in committing sin than good men are in doing good; which shows great folly and stupidity. The Targum is,

``they are become foolish, they have erred.''

Jeremias 9:5 In-Context

3 And they have bent their tongue like a bow: falsehood and not faithfulness has prevailed upon the earth; for they have gone on from evil to evil, and have not known me, saith the Lord.
4 Beware ye each of his neighbour, and trust ye not in your brethren: for every one will surely supplant, and every friend will walk craftily.
5 Every one will mock his friend; they will not speak truth: their tongue has learned to speak falsehoods; they have committed iniquity, they ceased not, so as to return.
6 usury upon usury, and deceit upon deceit: they would not know me, saith the Lord.
7 Therefore thus saith the Lord, Behold, I will try them with fire, and prove them; for I will do because of the wickedness of the daughter of my people.

The Brenton translation of the Septuagint is in the public domain.