'Disloyal' in the Bible

(The Bridegroom)“I have come into my garden, my sister, my [promised] bride;I have gathered my myrrh along with my balsam and spice [from your sweet words].I have eaten my honeycomb with my honey;I have drunk my wine with my milk.Eat, friends;Drink and drink deeply, O lovers.”

They profess to know God [to recognize and be acquainted with Him], but by their actions they deny and disown Him. They are detestable and disobedient and worthless for good work of any kind.

Come close to God [with a contrite heart] and He will come close to you. Wash your hands, you sinners; and purify your [unfaithful] hearts, you double-minded [people].

If anyone comes to you and does not bring this teaching [but diminishes or adds to the doctrine of Christ], do not receive or welcome him into your house, and do not give him a greeting or any encouragement;