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.
Weary themselves to commit iniquity - are at laborious pains to act perversely (Maurer). Sin is a hard bondage (Habakkuk 2:13, "Behold, is it not of the Lord of hosts that the people shall labour in the very fire, and the people shall weary themselves for very vanity").