'Deal Treacherously' in the Bible

Have we not all one father? hath not one God created us? why do we deal treacherously every man against his brother, by profaning the covenant of our fathers?

And did not he make one? Yet had he the residue of the spirit. And wherefore one? That he might seek a godly seed. Therefore take heed to your spirit, and let none deal treacherously against the wife of his youth.

For I hate sending away, said Jehovah, God of Israel, And He who hath covered violence with his clothing, said Jehovah of Hosts, And ye have been watchful over your spirit, And ye do not deal treacherously.