وَكَذَٰلِكَ أَنزَلْنَـٰهُ حُكْمًا عَرَبِيًّا ۚ وَلَئِنِ ٱتَّبَعْتَ أَهْوَآءَهُم بَعْدَ مَا جَآءَكَ مِنَ ٱلْعِلْمِ مَا لَكَ مِنَ ٱللَّهِ مِن وَلِىٍّ وَلَا وَاقٍ
Wa kazaalika anzalnaahu hukman 'Arabiyyaa; wa la'init taba'ta ahwaaa 'ahum ba'da maa jaaa'aka minal 'ilmi maa laka minal laahi minw waliyinw wa laa waaq
So We have sent down the Quran to give judgement in the Arabic language. If you were to follow their desires, after the knowledge that has come to you, you would have no one to guard you or protect you from God.
And so we have sent it down as a decisive judgment in Arabic. If you were to follow their desires after the knowledge that has come to you, you would have no ally against God, and no protector.