Qur'ān 39:28 · Az-Zumar (الزمر)

قُرْءَانًا عَرَبِيًّا غَيْرَ ذِى عِوَجٍۢ لَّعَلَّهُمْ يَتَّقُونَ

[It is] an Arabic Qur'an, without any deviance that they might become righteous.