Loyalty is the mark of a true friend. It's in the Bible, Proverbs 17:17, TLB. "A true friend is always loyal, and a brother is born to help in time of need."
Our loyalty to God cannot be divided. It's in the Bible, Matthew 6:24, NIV. "No one can serve two masters. Either he will hate the one and love the other, or he will be devoted to the one and despise the other. You cannot serve both God and Money."