Fair Dealing (Al-Ma'ida 5:9)
O ye 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 ye do. (verse 5:9)
Other Links:
An-Nahl (Verse16:66) : Milk
Surah Al Hadiid (verse 25): Formation of Iron
Surah Al-Anaam(verse 126)
Surah Prophets (Verse 32)