Surah Al-A'raf (The Heights), Verse 90

وَقَالَ الْمَلَاُ الَّذِیْنَ كَفَرُوْا مِنْ قَوْمِهٖ لَىِٕنِ اتَّبَعْتُمْ شُعَیْبًا اِنَّكُمْ اِذًا لَّخٰسِرُوْنَ ۟

Wa qaalal mala ul lazeena kafaroo min qawmihee la'init taba'tum Shu'aiban innakum izal lakhaasiroon

“The leaders, the unbelievers among his people, said: "If ye follow Shu'aib, be sure then ye are ruined!"”

Quran 7:90 (Yusuf Ali Translation)