In The Bible
Attempting to serve two masters leads to “double-mindedness” (James 4:8), undermining loyalty to a cause. The Bible also speaks of loyal ones, which would be those who follow the Bible with absolute loyalty, as in "Precious in the eyes of God is the death of his loyal ones", (Psalms 116:15) Most Jewish and Christian authors view the binding of Isaac (Genesis 22), in which Abraham was called by God to offer Isaac as a burnt offering, as a test of Abraham's loyalty to God. Joseph's faithfulness to his master Potiphar and his rejection of Potiphar's wife's advances (Genesis 39) have also been called an example of the virtue of loyalty.
Read more about this topic: Loyalty