Surah Al-Isra — Ayah 94 (17:94)
وَمَا مَنَعَ ٱلنَّاسَ أَن يُؤۡمِنُوٓاْ إِذۡ جَآءَهُمُ ٱلۡهُدَىٰٓ إِلَّآ أَن قَالُوٓاْ أَبَعَثَ ٱللَّهُ بَشَرٗا رَّسُولٗا ٩٤
English translation (Saheeh International)
And what prevented the people from believing when guidance came to them except that they said, "Has Allāh sent a human messenger?"
Brief commentary
And the only thing which stopped the disbelievers from bringing faith upon Allah and His Messengers, and acting upon what the Messenger brought, was their refusal to accept that a Messenger can be from humankind, as they said denyingly: Did Allah send a Messenger from humankind?