Qur'an 11:26 · Hud

أَن لَّا تَعْبُدُوٓا۟ إِلَّا ٱللَّهَ ۖ إِنِّىٓ أَخَافُ عَلَيْكُمْ عَذَابَ يَوْمٍ أَلِيمٍۢ

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