Surat An-Naĥl - سورة النحل

وَعَلَى اللَّهِ قَصْدُ السَّبِيلِ وَمِنْهَا جَائِرٌ ۚ وَلَوْ شَاءَ لَهَدَاكُمْ أَجْمَعِينَ

: And upon Allah is the responsibility to explain the Straight Path (i.e. Islamic Monotheism for mankind i.e. to show them legal and illegal, good and evil things, etc. so, whosoever accepts the guidance, it will be for his own benefit and whosoever goes astray, it will be for his own destruction), but there are ways that turn aside (such as Paganism, Judaism, Christianity, etc.). And had He willed, He would have guided you all (mankind).