'Harmony' in the Bible

Live in harmony with each other. Do not be arrogant, but associate with humble people. Do not think that you are wiser than you really are.

Now may God, the source of endurance and encouragement, allow you to live in harmony with each other as you follow the Messiah Jesus,

What harmony exists between the Messiah and Beliar, or what do a believer and an unbeliever have in common?

Finally, all of you must live in harmony, be sympathetic, love as brothers, and be compassionate and humble.