Qu'ran, Al-Imran, Surah 3:103
Stay united and adhere to the faith of Allah, and let nothing sow dissension among you. Remember how He bestowed His favor upon you and united your hearts after your animosities that you became as brothers by His grace. You were upon the brink of the abyss of fire, yet He saved you from it. Thus Allah makes clear His revelations to You, that you may be guided.