Word by Word Analysis

ثُمَّ ءَاتَيْنَا مُوسَى ٱلْكِتَـٰبَ تَمَامًا عَلَى ٱلَّذِىٓ أَحْسَنَ وَتَفْصِيلًا لِّكُلِّ شَىْءٍ وَهُدًى وَرَحْمَةً لَّعَلَّهُم بِلِقَآءِ رَبِّهِمْ يُؤْمِنُونَ 154

Then We gave Moses the Scripture, making complete [Our favor] upon the one who did good [i.e., Moses] and as a detailed explanation of all things and as guidance and mercy that perhaps in the meeting with their Lord they would believe.