قال الله تعالى: "وَإِنَّهُ لَتَنْزِيلُ رَبِّ الْعَالَمِينَ ﴿192﴾ نَزَلَ بِهِ الرُّوحُ الْأَمِينُ ﴿193﴾ عَلَىٰ قَلْبِكَ لِتَكُونَ مِنَ الْمُنْذِرِينَ ﴿194﴾ بِلِسَانٍ عَرَبِيٍّ مُبِينٍ ﴿195﴾" سورة الشعراء.

192. It is a revelation from the Lord of the Worlds.

193. The Honest Spirit came down with it.

194. Upon your heart, so that you may be of the Warners.

195. In a clear Arabic language. 

Surah Ash-Shuara.