And unto Median did We send their brother Shu'eyb (Jethro?), who said, "O my people! Serve Allah; you have no God save Him. There has come to you a manifest Sign from your Lord. So give good weight and full measure, and be not niggardly of your good works (or of the gifts you have received) to mankind, and do not evil in the earth after it has been rightly ordered. That is better for you if you are believers.