'Yawning' in the Bible

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.

“You inhabitants of Moab,Leave the cities and live among the rocks,And be like the dove that makes her nestIn the walls of the yawning ravine.

“Their throat is an open grave;They [habitually] deceive with their tongues.”“The venom of asps is beneath their lips.”