وَلَقَد جِئناهُم بِكِتابٍ فَصَّلناهُ عَلىٰ عِلمٍ هُدًى وَرَحمَةً لِقَومٍ يُؤمِنونَ

And We had certainly brought them a Book which We detailed by knowledge - as guidance and mercy to a people who believe.