Prophet Hud - 11:90
Ask forgiveness from your Lord, then repent to Him. Surely my Lord is Most Merciful, Loving.
The sins of Shu'ayb's people, the Median people, which required forgiveness and repentance:
Prophet Hud/11:84
"And to Median We sent their brother Shu´ayb. He said: "O my people, serve Allah, you have no god but Him. Do not keep the measure and the weighing deficient. I see you in prosperity and I fear for you the torment of an encompassing Day."
Prophet Hud/11:85
O my people, measure and weigh exactly with justice. Do not shortchange the people and do not commit evil by corrupting the earth.
Prophet Hud/11:87
"They said: "Shu´ayb, does your prayer require us to give up what our ancestors used to serve or to turn our trade as we wish? You are indeed mild-tempered and wise."