'Faithlessly' in the Bible

If she does not please her master who has chosen her for himself [as a wife], he shall let her be redeemed [by her family]. He does not have the authority to sell her to a foreign people, because he has been unfair to her.

“Surely, as a wife treacherously (unfaithfully) leaves her husband,So you have dealt treacherously with Me,O house of Israel,” says the Lord.

“For the house of Israel and the house of JudahHave dealt very treacherously (faithlessly) with Me,” declares the Lord.

I will make the land desolate (ruined, deserted), because they have acted unfaithfully [through their idolatry],’ says the Lord God.”

“Therefore, son of man, speak to the house of Israel and say to them, ‘Thus says the Lord God, “Again in this your fathers have blasphemed Me, in that they acted faithlessly and treacherously against Me.

They have dealt treacherously against the Lord,For they have borne illegitimate (pagan) children.Now the New Moon will devour them along with their land [bringing judgment and captivity].

But they, like Adam, have transgressed the covenant;There they have dealt treacherously against Me.

Do we not all have one Father? Has not one God created us? Why do we deal treacherously with one another, profaning the covenant of our fathers [with God]?

“For I hate divorce,” says the Lord, the God of Israel, “and him who covers his garment with wrong and violence,” says the Lord of hosts. “Therefore keep watch on your spirit, so that you do not deal treacherously [with your wife].”