مريم — Maryam Ayat 97
فَاِنَّمَا يَسَّرْنٰهُ بِلِسَانِكَ لِتُبَشِّرَ بِهِ الْمُتَّقِيْنَ وَتُنْذِرَ بِهٖ قَوْمًا لُّدًّا
Fa innamā yassarnāhu bilisānika litubasysyira bihil-muttaqīna wa tunżira bihī qaumal luddā(n).
"So, [O Muhammad], We have only made Qur'an easy in the Arabic language that you may give good tidings thereby to the righteous and warn thereby a hostile people."