Surah Hud, ayah 26

11:26

أَن لَّا تَعۡبُدُوٓاْ إِلَّا ٱللَّهَۖ إِنِّيٓ أَخَافُ عَلَيۡكُمۡ عَذَابَ يَوۡمٍ أَلِيمٖ ٢٦

Al lā ta'budū illallāha innī akhāfu 'alaykum 'adhāba yawmin alīm

That you not worship except Allāh. Indeed, I fear for you the punishment of a painful day."