Yahya related to me from Malik that Abu'z-Zinad heard Sa'id ibnal-Musayyab andSulayman ibn Yasar forbid a man to sell wheat for goldon delayed terms and then to buy dried dates with the gold before hehad taken delivery of the gold.
USC-MSA web (English) reference: Book 31, Hadith 47
Arabic reference: Book 31, Hadith 1339