What does the Bible have to say about loyalty and being loyal?
Loyalty is unwavering in good times and bad. (Proverbs 17:17)
Loyalty is what you do, not what you say. (Matthew 26:33-35 and 26:69-75)
Loyalty is in your heart. It is willing and not reluctant. (Psalm 78:8)
Loyalty can be demanding. (Exodus 17:8-13)
Loyalty may involve sacrifice. (2 Chronicles 11:13-16)
Loyalty to the Lord will be rewarded. (Psalm 84:10-11) When this psalm says “those whose walk is blameless” it refers to Genesis 17:1 when the Lord appeared to Abraham and said to him “walk with me and be blameless” meaning that Abraham would receive the Lord’s promises if he was faithful and obedient.
Disloyalty will be punished. Because Edom deserted Israel in its time of need, "I will bring you plummeting down," said the Lord. (Obadiah 1:4-14, especially verses 4 and 11)