'Deal Treacherously' in the Bible

Is there not, one Father, to us all? Did not, one GOD, create us? Wherefore should we deal treacherously one with another, profaning the covenant of our fathers?

Now was it not, One, who made you who had, the residue of the spirit? What, then, of that One? He was seeking a godly seed. Therefore should ye take heed to your spirit, and, with the wife of thy youth, do not thou deal treacherously.

For he hateth divorce, saith Yahweh, God of Israel, him also who covereth with violence his own clothing, saith Yahweh of hosts, - therefore should ye take heed to your spirit, and not deal treacherously.