Quran 16:101-103

And if  We exchange a verse in place of another verse; and God is more aware of what He is revealing; they say: "You are making this up!" Alas, most of them do not know.

Say: "The Holy Spirit has brought it down from your Lord with truth, so that those who believe will be strengthened, and as a guidance and good news for those who have submitted."

And We are aware that they say: "A human is teaching him." The language of the one they refer to is foreign, while this is a clear Arabic language.