Al-A'raf - 7:65

وَإِلَى عَادٍ أَخَاهُمْ هُوداً قَالَ يَا قَوْمِ اعْبُدُواْ اللّهَ مَا لَكُم مِّنْ إِلَـهٍ غَيْرُهُ أَفَلاَ تَتَّقُونَ
[7:65]
And to Ad (We sent) their brother Hud. He said: O my people! serve Allah, you have no god other than Him; will you not then guard (against evil)?
To the 'Ad people, (We sent) Hud, one of their (own) brethren: He said: O my people! worship Allah! ye have no other god but Him will ye not fear (Allah)?"
And unto (the tribe of) A'ad (We sent) their brother, Hud. He said: O my people! Serve Allah. Ye have no other Allah save Him. Will ye not ward off (evil)?