Verse/hadith that says Allah creates out of nothing

Are there any Quranic verse or Hadith that says Allah can create things out of nothing? If you site this verse: >Originator of the heavens and the earth. When He decrees a matter, He only says to it, "Be," and it is. (2:117) Please explain how it conveys creation from nothingness? May be it is obvious from the verse and I am unable to understand it!