Musnad Ahmad 28:195

Isma'il ibn Ibrahim narrated to us, Ayyub narrated to us, 'Amr ibn Shu'ayb narrated to me, my father narrated to me, from his father, who said: 'Abdullah ibn 'Amr mentioned, and said: The Messenger of Allah (ﷺ) said: "A loan and a sale are not permissible, nor are two conditions in one sale, nor the profit of what is not guaranteed, nor the sale of what you do not possess."