Quran 7:59 from Surah Al-A'raaf on Divine Marvels.
لَقَدۡ أَرۡسَلۡنَا نُوحًا إِلَىٰ قَوۡمِهِۦ فَقَالَ يَٰقَوۡمِ ٱعۡبُدُواْ ٱللَّهَ مَا لَكُم مِّنۡ إِلَٰهٍ غَيۡرُهُۥٓ إِنِّيٓ أَخَافُ عَلَيۡكُمۡ عَذَابَ يَوۡمٍ عَظِيمٖ
English translation: Certainly We sent Nuh to his people and he said O my people! Worship Allah not for you any god other than Him Indeed I [I] fear for you punishment (of the) Day Great
Transliteration: laqad arsalna nuhan ila qawmihi faqala yaqawmi u'budu al-laha ma lakum min ilahin ghayruhu inni akhafu alaykum adhaba yawmin azimin