﴿ فَإِنَّمَا يَسَّرْنَٰهُ بِلِسَانِكَ لِتُبَشِّرَ بِهِ ٱلْمُتَّقِينَ وَتُنذِرَ بِهِۦ قَوْمًۭا لُّدًّۭا ﴾

“and only to this end have We made this [divine writ] easy to understand, in thine own tongue, [O Prophet,] so that thou might convey thereby a glad tiding to the God-conscious, and warn thereby those who are given to [futile] contention:”

Indeed We have made it easy namely the Qur’ān in your tongue only that you may bear good tidings therewith to the God-fearing those who will be prosperous because of their faith and warn threaten therewith a folk who are contumacious luddan the accusative plural of aladd in other words extremely disputatious using false arguments — and they are the disbelievers of Mecca.