﴿ أَن لَّا تَعْبُدُوٓا۟ إِلَّا ٱللَّهَ ۖ إِنِّىٓ أَخَافُ عَلَيْكُمْ عَذَابَ يَوْمٍ أَلِيمٍۢ ﴾

“that you may worship none but God-for, verily, I fear lest suffering befall you on a grievous Day!"”

That you worship none but God. Lo! I fear for you should you worship other than Him the chastisement of a painful day’ painful in this world and in the Hereafter.