Hud - 11:26

أَن لاَّ تَعْبُدُواْ إِلاَّ اللّهَ إِنِّيَ أَخَافُ عَلَيْكُمْ عَذَابَ يَوْمٍ أَلِيمٍ
[11:26]
That you shall not serve any but Allah, surely I fear for you the punishment of a painful day.
"That ye serve none but Allah: Verily I do fear for you the penalty of a grievous day."
That ye serve none, save Allah. Lo! I fear for you the retribution of a painful Day.