Matthew Poole and continuators on Jeremiah 9:5

5 And they will deceive every one his neighbour, and will not speak the truth: they have taught their tongues to speak lies, and i weary themselves to commit iniquity.

Heb. mock or deride; they are Scoffers.

They have so framed their tongues to it by custome, and constant use, that lying is become so familiar to them, that they cannot leave it▪ the same word is apply'd to the wild Ass, used or taught to the wilderness, chap. 2.24. and 13.23.

They use a great deal of Industry, Diligence and Contrivance in it, Psal. 7.14. Isa. 5.18. They spare for no Labour, and feel no weariness in it, whereby they are become expert.

Marginal references: Or, mock.