Muwatta Malik, Book 31, Hadith 47 (USC-MSA) ⓘ
Yahya related to me from Malik that Abu'z-Zinad heard Sa'id ibn al-Musayyab andSulayman ibn Yasar forbid a man to sell wheat for gold on delayed terms and then to buy dried dates with the gold before he had taken delivery of the gold.
حَدَّثَنِي يَحْيَى، عَنْ مَالِكٍ، عَنْ أَبِي الزِّنَادِ، أَنَّهُ سَمِعَ سَعِيدَ بْنَ الْمُسَيَّبِ، وَسُلَيْمَانَ بْنَ يَسَارٍ، يَنْهَيَانِ أَنْ يَبِيعَ الرَّجُلُ، حِنْطَةً بِذَهَبٍ إِلَى أَجَلٍ ثُمَّ يَشْتَرِيَ بِالذَّهَبِ تَمْرًا قَبْلَ أَنْ يَقْبِضَ الذَّهَبَ
also referenced under: Book 31, Hadith 1339 (In-Book)