Al-An’aam : 153

وَأَنَّ هَٰذَا صِرَاطِي مُسْتَقِيمًا فَاتَّبِعُوهُ ۖ وَلَا تَتَّبِعُوا السُّبُلَ فَتَفَرَّقَ بِكُمْ عَن سَبِيلِهِ ۚ ذَٰلِكُمْ وَصَّاكُم بِهِ لَعَلَّكُمْ تَتَّقُونَ [Al-An’aam : 153]
(6:153) (x) This is My way -that which is straight: follow it, then, and do not follow other paths lest they scatter you from His path. *135 This is what He has enjoined upon you, so that you may beware.’
*135). It is an essential corollary of the natural covenant mentioned above that man should follow the way prescribed by his Lord; any deflection from the orders of God, or serving anyone other than Him, constitutes a primary breach of that covenant. Once this breach has been committed every single article of the covenant is likely to be violated one after the other. Moreover, it should also be remembered that man cannot acquit himself of the highly delicate, extensive and complex set of responsibilities entailed by this covenant unless he accepts the guidance of God and tries to follow the way prescribed by Him.
Non-acceptance of God’s guidance necessarily produces two grave and damaging consequences. First, by following any other way, one is inevitably led away from the true path and is thus deprived of the opportunity to approach God and please Him. Second, as soon as man deviates from the Straight Way prescribed by God, he encounters a whole labyrinth of highways and byways, causing the entire human species to fall a prey to total bewilderment and perplexity, and which shatters all dreams of a steady advance towards maturity and betterment. The words ‘follow not other paths for they will scatter you away from His path’ hint at this damage. (See Surah al-Ma’idah 5, n. 35 above.)