Quran 74:25 from Surah Al-Muddaththir on Divine Marvels.
إِنۡ هَٰذَآ إِلَّا قَوۡلُ ٱلۡبَشَرِ
English translation: Not (is) this but (the) word (of) a human being
Transliteration: in hadha illa qawlu al-bashari