'Truthful' in the Bible

“Shall God’s retribution [for your sins] be on your terms, because you refuse to accept it?For you must do the choosing, and not I;Therefore say what you [truthfully] know.

For there is nothing trustworthy or reliable or truthful in what they say;Their heart is destruction [just a treacherous chasm, a yawning gulf of lies].Their throat is an open grave;They [glibly] flatter with their [silken] tongue.

Truthful lips will be established forever,But a lying tongue is [credited] only for a moment.

A truthful witness saves lives,But he who speaks lies is treacherous.