Surah An-Nahl 16:103

ﱁ ﱂ ﱃ ﱄ ﱅ ﱆ ﱇ ﱈ ﱉ ﱊ ﱋ ﱌ ﱍ ﱎ ﱏ ﱐ ﱑ

And We certainly know that they say, "It is only a human being who teaches the Prophet." The tongue of the one they refer to is foreign, and this Qur'an is [in] a clear Arabic language.