And if you are in doubt as to what We have revealed from time to time to Our servant, then produce a Sura like thereunto; and call your witnesses or helpers (if there are any) besides Allah, if your (doubts) are true.
Qur’an 2:23
Qur’an 5:8
O you who believe! stand out firmly for Allah, as witnesses to fair dealing, and let not the hatred of others to you make you swerve to wrong and depart from justice. Be just: that is next to Piety: and fear Allah. For Allah is well-acquainted with all that you do.