Al-A'raf · 7:85

85. To the tribe of Midian Allah sent their brother Shu‘ayb (peace be upon him). He said: 'O people! Worship Allah alone for you have no God worthy of worship other than Him. A clear proof from Allah has come to you confirming what I bring to you from your Lord is the truth. Give people their rights, by measuring and weighing things correctly, not short-changing people by saying bad things about their goods, or by cheating them, and do not to cause corruption on earth through disbelief and disobedience after things have been set right through the sending of prophets. All of this is better for you and more beneficial if you are believers, because then you would leave disobedience, and draw close to Allah by doing what He has commanded.'