سورة Al-Jathiya ( Crouching ) - الآية 18

Then We have put you (O Muhammad SAW) on a plain way of (Our) commandment [like the one which We commanded Our Messengers before you (i.e. legal ways and laws of the Islamic Monotheism)]. So follow you that (Islamic Monotheism and its laws), and follow not the desires of those who know not. [Tafsir At-Tabari Vol. 25, Page 146].