"I asked the Prophet "O Messenger of Allah, a man may come to me and ask me to sell him something that I do not have. Can I sell it to him then go and buy it from the market?' He said: 'Do not sell what you do not have.'''
Sunan an-Nasa'i Book 44, Hadith 165
← Previous Hadith "The Messenger of Allah said: 'No man is bound by a transaction involving the sale of something that he does not possess.'''

Sunan an-Nasa'i Book 44, Hadith 164 Next Hadith → 'We used to pay in advance during the time of the Messenger of Allah and Abu Bakr and 'Umar, for wheat, barley and dates, paying people whom we did not know if they had those things or not.'''Ibn Abza said meaning, similarly.

Sunan an-Nasa'i Book 44, Hadith 166