'Fidelity' in the Bible

Let your fountain (wife) be blessed [with the rewards of fidelity],And rejoice in the wife of your youth.

By mercy and lovingkindness and truth [not superficial ritual] wickedness is cleansed from the heart,And by the fear of the Lord one avoids evil.

“Because he who blesses himself on the earthWill bless himself by the God of truth and faithfulness;And he who swears [an oath] on the earthWill swear by the God of truth and faithfulness;Because the former troubles are forgotten,And because they are hidden from My sight.

We have given the hand [as a pledge of fidelity and submission] to Egypt and Assyria to get enough bread.