Qur'ān 45:18 · Al-Jathiyah (الجاثية)

ثُمَّ جَعَلْنَـٰكَ عَلَىٰ شَرِيعَةٍۢ مِّنَ ٱلْأَمْرِ فَٱتَّبِعْهَا وَلَا تَتَّبِعْ أَهْوَآءَ ٱلَّذِينَ لَا يَعْلَمُونَ

Then We put you, [O Muhammad], on an ordained way concerning the matter [of religion]; so follow it and do not follow the inclinations of those who do not know.