And unto Midian [We sent] their brother, Shu’ayb. He said: O my people! Serve God! Ye have no other god save Him. Lo! A clear proof hath come unto you from your Lord; so give full measure and full weight and wrong not mankind in their goods, and work not confusion in the land after the fair ordering thereof. That will be better for you, if ye are believers. تنزيل اموال حقيقية

The Holy Qur’an relates his mission as follows (7: 85):

The Prophet Shu’ayb (called Jethro in the Bible,u) is a descendant of the Prophet Ibrahim. He is one of four Arab Prophets mentioned in the Qur’an (Hud, Salih, Shu’ayb and Muhammad, r; the Prophet Ismail / Ishmael also became Arabised and spoke Arabic later in his life, after settling in Mecca): he was from the tribe of Midian, who lived in the vicinity of Ma’an in Jordan. مراهنات كرة القدم The people of Midian were heathen bandits that cheated and terrorized travellers. God sent Shu’ayb to warn  Them to desist, But they rejected him, and so God destroyed them. Shu’ayb was also Musa’s and Harun’s father-in-law, and the Qur’an relates the story of how Musa worked for him for ten years as payment for dowry. Shu’ayb was also said to be the only Prophet known to be blind.