Surah Al-Ankabut (The Spider), Verse 16

وَاِبْرٰهِیْمَ اِذْ قَالَ لِقَوْمِهِ اعْبُدُوا اللّٰهَ وَاتَّقُوْهُ ذٰلِكُمْ خَیْرٌ لَّكُمْ اِنْ كُنْتُمْ تَعْلَمُوْنَ ۟

Wa Ibraheema iz qaala liqawmihi' budul laaha wattaqoohu zaalikum khayrul lakum in kuntum ta'lamoon

“And (We also saved) Abraham: behold, he said to his people, "Serve Allah and fear Him: that will be best for you- If ye understand!”

Quran 29:16 (Yusuf Ali Translation)