Surah An Nahl Tafseer

وَمَا أَنزَلْنَا عَلَيْكَ الْكِتَابَ إِلاَّ لِتُبَيِّنَ لَهُمُ الَّذِي اخْتَلَفُواْ فِيهِ

And We have not revealed the Book to you, except that you may clearly explain to them those things in which they differ,

Allah says to His Messenger that He has revealed the Book to him to explain the truth to mankind in matters which they dispute over. So the Qur'an is a decisive arbitrator for every issue that they argue about.

وَهُدًى

and (as) a guidance,

meaning, for their hearts.

وَرَحْمَةً

and a mercy,

meaning, for the one who adheres to it.

لِّقَوْمٍ يُوْمِنُونَ

for a people who believe