'Deal' in the Bible

Don't we all have one father? Hasn't one God created us? Why do we deal treacherously every man against his brother, profaning the covenant of our fathers?

Did he not make you one, although he had the residue of the Spirit? Why one? He sought a godly seed. Therefore take heed to your spirit, and let no one deal treacherously against the wife of his youth.

For I hate divorce," says Yahweh, the God of Israel, "and him who covers his garment with violence!" says Yahweh of Armies. "Therefore take heed to your spirit, that you don't deal treacherously.