Sahih Bukhari Volume 009, Book 093, Hadith Number 648.
Hadith Section/Book: Sahih Bukhari Sahih Bukhari Book 93. Oneness, Uniqueness of Allah (Tawheed)
Narrated By Abu Huraira : I heard the Prophet saying, "Allah said, 'Who are most unjust than those who try to create something like My creation? I challenge them to create even a smallest ant, a wheat grain or a barley grain.'"