Jeremiah 9:5 in the King James Version
And they will deceive every one his neighbour, and will not speak the truth: they have taught their tongue to speak lies, and weary themselves to commit iniquity.
Context
4 “Everyone beware of his neighbor, and don’t trust in any brother; for every brother will utterly supplant, and every neighbor will go around like a slanderer.
5 Friends deceive each other, and will not speak the truth. They have taught their tongue to speak lies. They weary themselves committing iniquity.
6 Your habitation is in the middle of deceit. Through deceit, they refuse to know me,” says the LORD.