Sahih Bukhari
Oneness, Uniqueness of Allah (Tawheed)
Volume: 009 / Book Number: 093 / Hadith Number: 648
Narrated 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.' "