Surah Yunus — Ayah 99 (10:99)
وَلَوۡ شَآءَ رَبُّكَ لَأٓمَنَ مَن فِي ٱلۡأَرۡضِ كُلُّهُمۡ جَمِيعًاۚ أَفَأَنتَ تُكۡرِهُ ٱلنَّاسَ حَتَّىٰ يَكُونُواْ مُؤۡمِنِينَ ٩٩
English translation (Saheeh International)
And had your Lord willed, those on earth would have believed - all of them entirely. Then, [O Muḥammad], would you compel the people in order that they become believers?
Brief commentary
If your Lord, O Messenger, had willed for everyone on earth to believe, they would have done so. However, He did not will it to be so for a wise reason. He misguides whomever He wills through His justice; and He guides whomever He wills through His grace. You do not have the ability to force people to become believers: their guidance to faith lies only in Allah’s Hands.